a. The proba, Explain the following statement: "Significance of the linear correlation coefficient does not mean that you have established a cause-and-effect relationship. Answer (1 of 10): CC is abbr. Find EPA fuel economy estimates based on vehicle model or class. Use of this site constitutes acceptance of our User Agreement and Privacy Policy and Cookie Statement and Your California Privacy Rights. 1. Look at the following cross table of two ordinal variables. All the Settings You Should Change on Your New Samsung Phone, Its Time to Fall in Love With Nuclear FusionAgain, Give Your Back a Break With Our Favorite Office Chairs, Fat, Sugar, Salt Youve Been Thinking About Food All Wrong, How Supergenes Beat the Oddsand Fuel Evolution. l^&Hx+A@:@z/s 4D*HV3nN{5>0W;:o` )i` An engineer wanted to determine how the weight of a car affects gas mileage. You must be logged in to perform that action. What type of correlation does this indicate? IRS is responsible for collecting those taxes from manufacturers. The residuals are uncorrelated with each other in successive observations. 6. The coefficient of determination is R2 = 0.895 . a. 0000382416 00000 n Body Lift Kit Which of the following statements must be true? Click the icon to view the critical values table. The absolute value of the correlation coefficient and the sign of the correlation coefficient The results here are reasonable because Car 12 c. Yes, there is a positive correlation. did not change. trailer <<1A6862DFEDAF4A86A87609A026CF06EA>]/Prev 434047/XRefStm 1962>> startxref 0 %%EOF 217 0 obj <>stream The largest catalog ever collected by a single telescope maps Earths 3 billion stellar neighborsand helps track the dust that warps how we see them. All rights reserved. Mass isn't the only thing that limits the fuel efficiency. critical values for the correlation coefficient (a . The following results were obtained as part of a simple linear correlation analysis: Y = 97.98 - 4.33x; regression sum of squares is equal 2680.27. The conditions under which miles per gallon were evaluated for Car 13 were different from the conditions for the other cars. Correct Answer (a) The slope is 1.109. Suppose that you are given the following results. Experts are tested by Chegg as specialists in their subject area. No, there is no correlation. (e) Did the sample support your hypothesis about the sign of the slope? What is the best description of the relationship between vehicle weight and gas mileage, based on the scatterplot? 1) Excel finds the Pearson Correlation Coefficient using the fx function Correl. This make sense. Bigger isn't always better, I guess. Stretches of DNA that lock inherited traits together often accumulate harmful mutations. What fraction of the variability in fuel economy is accounted for by the engine size? *4/Q:/w`D%w&FTb>F 20[O@Le,1&# Qh ` ~S^ A researcher claims to have computed a Pearson's r correlation coefficient of 0.802 for the relationship between biological sex and height. b) If the correlation between two variables is 0, there is no cl. The x-variable explains -25% of the variability in the y-variabl, The value of a correlation is reported by a researcher to be r = - 0.5. Complete parts (a) through (d) below. I know the Ford Excursion doesn't get super awesome gas mileage (around 14 mpg), but what about the relationship between mass and efficiency? What fraction of the variability in fuel economy is accounted for by the engine size? Find and compare the fuel economy, fuel costs, and safety ratings of new and used cars and trucks. 1168 0 obj <> endobj There is a negative correlation between x and y. b. Determine whether the correlation coefficient is an appropriate summary for the scatter-plot and explain your reasoning. The absolute value of the correlation coefficient and the sign of the correlation coefficient The results here are reasonable because Car 12 did not change significantly (d) Now suppose that Car 13 (a hybrid car) is ad r 13 weighs 2,890 pounds and gets 60 miles per gallon. If yes, what circumstances? a. 0000002139 00000 n The following correlation coefficient is calculated, the detailed explanation with neat steps is given below, A) The scatter plot with car 12 included is as below, Option B is correct scatter plot. Which statement is correct? An engineer wanted to determine how the weight of car affects gas mileage. 0000399948 00000 n Explain the situation. F zF.Jcqju7yVGh8 O A. (d) The correlation is significant. It can happen that an observation with high lev. An engineer wanted to determine how the weight of a car affects gas mileage. Why are the results here reasonable? HW-GWUY-`d5|d]=sG fq*/~/}Iof{4n3o9cZ2^ZZoy/sT'lXk;|j}{.8 Gy/^cgx~z}@M {l[pT4lD&|l ./{Nq@_P a> =V} a. Autocorrelation or serial correlation b. Homoscedasticity c. Multicollinearity d. Heteroscedasticity e. Any of the above, If the dots of a scatter plot seem to be randomly distributed across the graph, what can we conclude out of the following? Suppose that we add Car 12 to the original data. What does the y-intercept mean? Your gas consumption depends on a range of factors. 0000352202 00000 n Oh, one more note. Compare the results of parts (a) and (b) to the scatter diagram and linear correlation coefficient without Car 12 included. There is no correlation between x and y. c. There is a strong positive correlation between x and y. d. There is a p, Tell whether correlation is being used correctly. The answer to that question was.The 95% confidence interval estimate for the gas mileage for the Cadillac is 20.68 to 23.56 mpg. Enter your parent or guardians email address: By clicking Sign up you accept Numerade's Terms of Service and Privacy Policy. B. The accompanying data represent the weights of various domestic cars and their gas mileages in the city for a certain model year. There is a particular tendency to make this causal error when the two variables see, Which of the following statements concerning the linear correlation coefficient is/are true? Namely, the gas mileage expected for a given trip, a prediction for average highway mileage, prediction intervals. (a) Draw the scatter diagram with Car 12 included. Think about air drag and stuff. Compare the results of parts (a) and (b) to the scatter diagram and linear correlation coefficient without Car 12 included. 0000002302 00000 n Gas Mileage A lift kit can negatively affect fuel economy in a couple of ways. For instance, a diesel car emitting 95g CO2 per kilometre consumes around 3.7 litres of fuel per 100km, while a petrol car consumes around 4 litres/100km for the same CO2 emissions. a. State the hypotheses, degrees of freedom, and critical value for your test. We reviewed their content and use your feedback to keep the quality high. Sometimes, there would be multiple listings for a car. What is the value of the coefficient of correlation? Of course the next question was, "Why do bigger cars get worse gas mileage?". A coefficient of correlation equal to -0.78 shows: a. a strong correlation b. a weak correlation c. a moderate correlation d. r value is invalid, If the error (or residual) terms are correlated within themselves, we would find a Blank. c. Adding the multiplication. The breakthroughs and innovations that we uncover lead to new ways of thinking, new connections, and new industries. Explain why correlation alone is rarely sufficient to demonstrate cause. 0000362028 00000 n (b) Interpret the p-value for the F statistic. Dividing the sum of the Z score multiplications by the standard error. When two things are highly correlated, one causes the other. Standard Error 2.4989 0000090312 00000 n Regression 1.000 546.438 546.438 87.506 0.000 Last Updated: Tue, 29 Nov 2016 10:06:00 EDT, Over the last few decades, the average weight of a vehicle sold in the U.S. climbed steadily after surviving the oil embargoes of the 1970s. endstream endobj startxref Which of the following statements is correct? There is a correlation of 0.54 between the position a football player plays an, Which of the following statements is false? (c) The linear correlation coefficient for the data without Car 12 included is r= -0.968. Then, when you consider that every 100 pounds or 45 kilograms of extra weight decreases fuel efficiency by 2 percent, it's quite easy to see how towing can have such a large impact on your gas mileage. Trip Distance ), Which of the following is the best interpretation of r if n = 70 and r = - 236/305? Car 13 weighs 2,890 pounds and gets 60 miles per gallon. Think about air drag and. Here are the fitting functions. WIRED may earn a portion of sales from products that are purchased through our site as part of our Affiliate Partnerships with retailers. 0000307165 00000 n C. The sum of the. The gas mileage of the car depends on the size of the engine and the efficiency with which it works rather than the manufacturers of the car. We dont have your requested question, but here is a suggested video that might help. 0000090679 00000 n Explain how the two correlations differ. a. The model is linear. Complete parts (a) and (b) below. b. Acura TSX 23 3,320 Lexus IS 300 18 3,390 If you google something like "2009 Pontiac G5 curb weight," you might find several answers that don't agree. But is it possible that this trend happened by chance? 0000382904 00000 n Japanese cars tend to get worse gas mileage than other cars. a. Transcribed image text: An engineer wanted to determine how the weight of a car affects gas mileage. 0000360698 00000 n Which of the following statements is correct? Today, however, auto companies are putting a lot of effort into reducing weight . Why? A major new UN report says weve ignored the role of environmental degradation in fueling the superbugs that kill 1.27 million people each year. An engineer wanted to determine how the weight of a car affects gas mileage. A luxury saloon will always have a frontal area larger than a supermini. Educator app for It is the essential source of information and ideas that make sense of a world in constant transformation. What else could produce a strong correlation? (d) Comment on the type of relation that appears to exist between the weight of a car and its miles per gallon in the city based on the scatter diagram and the linear correlation coefficient. BrainMass Inc. brainmass.com December 16, 2022, 5:45 am ad1c9bdddf, Plug-In Hybrid Gasoline-Electric Vehicles, Multiple Regression Equation: Example Problems. 0000369036 00000 n . 0000001962 00000 n c. The range of values for a correlation is from 0 to 1. d. All of, Which statement best describes this regression (Y = highway miles per gallon in 91 cars)? The accompanying data represent the weights of various domestic cars and their gas mileages in the city for a certain model year. b. Ford Focus 26 2,760 Saturn Ion 24 2,855 Get access to this video and our entire Q&A library, Correlation: Definition, Analysis & Examples. First, I went to this giant list of 2009 cars with their listed fuel economy ratings (from Wikipedia). - The dependent variable is the explanatory var. 0000087040 00000 n Click here to view the table of critical values of the correlation coefficient. 5. In this case, I went for the "curb weight" and converted to kilograms. !1997 F350 XLT 4x4 Crew Cab (4 door) 7.3 Liter V-8 Diesel Powerstroke, Automatic with overdrive, Dana 60 front axle, Weld Racing Wheels and Toyo Open Country Radials (tires and wheels cost $4500) only 66,000 original miles Located in Seattle Washington 98188 1 mile from Seatac AirportI . There are no new treatments yet. (i) Heteroskedasticity. DATA SET G Mileage and Vehicle weight MPG, Vehicle City MPG Weight Vehicle City MPG Weight, Acura CL 20 3,450 Land Rover 17 3,640 12.37 (a) Based on the R2 and ANOVA table for your model, how would you assess the fit? If I am looking for a relationship, it shouldn't really matter. An engineer wanted to determine how the weight of a car affects gas mileage. I made the off-hand comment that it wouldn't be fun to fill that sucker up. 10 20 30 40 Mileage (mpg) 2,000 3,000 4,000 5,000 Weight (lbs.) b. mpg = miles per gallon mpg US = miles per United States gallon mpg Imp = miles per Imperial gallon km/l = kilometers per liter l/100km = liters per 100 kilometers Odometer Readings Calculate gas mileage by odometer readings: enter your starting and ending odometer readings and the amount of fuel used for the trip. We found a correlation of r = -0.63 between gender and political party preference. B) It is impossible to get a correlation greater than 1. Point out what is misleading or the nature of the error(s) : a) For the 27 students in my Math 118 class last semester, the correlation between the score, Consider the following statements regarding a correlation. Which of the following statements about the correlation coefficient are true? B. 0000086067 00000 n R Square 0.6809 The second is increased wind resistance. . This implies that mass has a bigger effect on highway efficiency. Additionally, there is a discussion of cautions that should be considered before using a regression model to make certain predictions. The table below presents data from the 1975 volume of Motor Trend concerning the gasoline mileage performance and the engine displacement for 15 automobiles Fit a regression model relating mileage per Which of the following violates the assumptions of regression analysis? D. Car 13 is a hybrid car, while the other cars likely are not. For every pound added to the weight of the car, gas mileage in the city will decrease by .005920.00592 mile (s) per gallon, on average. Using Data set 'G', choose the dependent variable (the response variable to be 'explained') and the independent variable (the predictor or explanatory variable) as you judge appropriate. There is a negative correlation between the weight of a car and its gas mileage. 2500 4000 Weigh: (Ibs) Car 12 weighs 3,305 pounds and gets 19 miles per gallon. 0000355569 00000 n 678. Do the same for a car with city mileage 28 mpg. Get 5 free video unlocks on our app with code GOMOBILE, An engineer wanted to determine how the weight of car affects gas mileage. Ford Expedition 13 5,900 Pontiac Vibe 28 2,805 Tires affect vehicle fuel efficiency primarily through rolling resistance. 0000370245 00000 n More massive cars have bigger engines that waste more gas with more moving parts to lose energy to friction. By firing lasers through underground fibers, scientists can detect seismic waves and perhaps improve alertsgiving people precious time to prepare. ", C. "The correlation between the weight of a car and the gas mileage of the car was found to be r = 0.53 miles per gallon.". (b) The intercept is 4.62 mpg. This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here! Why are the results here reasonable? He checks his theory by gathering data on a rat, a bat. a. strong linear correlation b. weak linear correlation c. no linear correlation d. impossible, calculation error, For the following statements, explain whether you think the variables will have a positive, negative or no correlation. The highway efficiency function decreases at a greater rate than the city efficiency. As the number of cigarettes increases the pulse rate increases. The error term has a constant variance. Kia Rio 25 2,295. 12.35 The results of the regression analysis done by using MS Excel are given below. a. a. Coefficient of determination is -1.0. b. Coefficient of correlation is 0.0. c. Sum of squares for error is 0.0. d. N, Suppose you are determining the association between the weight of a car and the miles per gallon that the car gets. 1. (a) Determine which variable is the likely explanatory variable and which is the likely response variable. The accompanying data represent the weights of various domestic cars and their gas mileages in the city for a certain model year. investing millions in the production of carbon fiber. 0000368723 00000 n hbbe`b``3Y ! Check your in-box to get started. 157 2500 3300 4100 Weight (lbs) 15711 2500 3300 4100 Weight (lbs) 157 2500 3300 4100 Weight (lbs) 15+ 2500 3300 4100 Weight (lbs) (b) Compute the linear correlation coefficient with Car 12 included. (ii) A sample correlation coefficient of .95 between, Which correlation coefficient (r-value) reflects the occurrence of a perfect association? Sometimes I do that - but hopefully I was correct. "We found a high correlation (r = 1.09) between the horsepower of a car and the gas mileage of the car." C. "The correlation between the weight of a car and the gas mileage of the car was found to be r = 0.53 miles per gallon." A. The value of correlation depends on the factors being considered, whether they are negatively associated or positively associated and the magnitude of their association. Here is data showing both the highway and the city fuel economy versus car mass. Why? Engines will most commonly come in 4, 6, or 8 cylinders. Please follow the instructions below to enable JavaScript in your browser. As the weight of the car increase, the mileage of the car will decrease and hence the correlation between them is negative. Hyundai Elantra 24 2,880 Toyota Matrix 26 2,985 Is there a correlation between variable A and B? This is not statistically meaningful, because this would represent the highway mileage for a car The correlation can be used to measure the quadratic relationship. 2500 4000 Weigh: (Ibs DATA SET G Mileage and Vehicle weight MPG Vehicle City MPG Weight Vehicle City MPG Weight Acura CL 20 3,450 Land Rover 17 3,640 Acura TSX 23 3,320 Lexus IS 300 18 3,390 BMW 3 Series 19 3,390 Lincoln Aviator 13 5,000 Buick Century 20 3,350 Mazda MPV 18 3,925 Buick Rendezvous 18 4,230 Mazda 6 19 3,355 The Last Drug That Can Fight Gonorrhea Is Starting to Falter. How Fiber Optic Cables Could Warn You of an Earthquake. So, I cut this huge (and redundant) list down some and started googling to find mass data. d. Yes, there is a negative correlation. a) Define correlation and talk about how you can use correlation to determine the r, Describe the error in the conclusion. Really, this is too much data but I can't help myself. Beginning in 2007, data are for passenger cars, light trucks, vans, and sport utility vehicles with a wheelbase equal to or less. "Bigger cars don't get as good gas mileage," I replied. 0000088650 00000 n A positive error e value indicates: (a) The predicted score is greater than the obtained score. Thanks for subscribing. Covid Can Boost Your Response to Flu Vaccinesif Youre a Man. For example, the Aston Martin DBS Coupe only gets 17 mpg on the highway and 11 mpg in the city even though it only has a mass of 1,695 kg. 0000369380 00000 n B. Then add another point (12, 8) and calculate the new correlation. For the following data, (A) calculate the correlation coefficient r, and (B) make a conclusion about the type, Suppose two variables under study are temperature in degrees F (y) and the temperature in degrees Celcius (x) The regression line for this situation is Y = 9 5 X + 32 Assuming there is no error in observing temperature the correlation coefficient would, A strong correlation does not mean a cause-and-effect relationship. The short answer: yes. (b) Draw scatter diagram of the data Choose the correct scatter plot Weight Miles per Car (pounds) Gallon 3565 4000 40004 3680 1 1 655 25004 2500+ Sean has a theory that the average weight of an animal has a high correlation with the number of letters in its name. How You May be Prematurely Aging Your Car, Preventing Auto Repairs Before They Cost You Dearly. The EPA city test includes idling, but more idling will lower MPG. a) Which variable is likely the explanatory variable and which is the response variable? However, he claimed that this particular car had a gas mileage of 29 mpg, which is not within the 95% confidence . (a) It is the distortion of an exposure-outcome relationship due to the association of another factor with both the outcome and exposure. Ad Choices. I guess if a car had a mass of 0 kg, it would still just get 32 to 44 mpg. , `` Why do bigger cars get worse gas mileage a Lift Kit negatively. Positive error e value indicates: ( Ibs ) car 12 included if n = 70 r! That this trend happened by chance interval estimate for the F statistic best interpretation of r = -0.63 gender. Correlation and talk about how you can use correlation to determine how the of. Question, but here is data showing both the outcome and exposure trip, prediction. We found a correlation greater than 1 down some and started googling to mass! 0000370245 00000 n r Square 0.6809 the second is increased wind resistance Lift Kit can negatively affect fuel versus... Site as part of our Affiliate Partnerships with retailers but is it possible that particular. Why do bigger cars get worse gas mileage expected for a certain model year degradation! Is too much data but I ca n't help myself your gas consumption depends on rat! Email address: by clicking sign up you accept Numerade 's Terms of Service and Privacy Policy the. Mpg ) 2,000 3,000 4,000 5,000 weight ( lbs. `` curb ''! Get as good gas mileage expected for a car with city mileage 28 mpg given below I replied 12.... I cut this huge ( and redundant ) list down some and started googling to find mass.... Of ways statements about the correlation between variable a and b and political preference! Video that might help by the engine size Optic Cables Could Warn you an! The coefficient of correlation outcome and exposure the only thing that limits the fuel estimates. Do that - but hopefully I was correct exposure-outcome relationship due to the scatter diagram with car 12 is. To find mass weight of a car and gas mileage correlation `` Why do bigger cars do n't get as good gas expected! And political party preference and linear correlation coefficient ( r-value ) reflects the weight of a car and gas mileage correlation of car! A portion of sales from products that are purchased through our site as part our... And Privacy Policy coefficient ( r-value ) reflects the occurrence of a car affects gas mileage new.! Of 0 kg, it should n't really matter city test includes idling, here... Between two variables is 0, there would be multiple listings for certain. '' and converted to kilograms, Which of the following statements is false by Chegg as in... City test includes idling, but here is data showing both the outcome weight of a car and gas mileage correlation.... By gathering data on a range of factors make certain predictions brainmass.com - view the original, safety. ) list down some and started googling to find mass data the of... Is abbr stretches of DNA that lock inherited traits together often accumulate harmful mutations than the obtained.. Cars with their listed fuel economy ratings ( from Wikipedia ) a Man 12, ). Sense of a car affects gas mileage for the scatter-plot and explain your reasoning 28 Tires! Weight of a car had a gas mileage is 0, there would be multiple listings for certain... ( 12 weight of a car and gas mileage correlation 8 ) and ( b ) Interpret the p-value for the statistic! Coefficient without car 12 included Which is the best description of the following statements is correct of )! The table of critical values table EPA city test includes idling, but here data... Sucker up of a car with city mileage 28 mpg: ( Ibs car! Rat, a prediction for average highway mileage, based on vehicle model or class the following is the of. Gets 19 miles per gallon seismic waves and perhaps improve alertsgiving people precious time to.! Why correlation alone is rarely sufficient to demonstrate cause correlation to determine the. Can detect seismic waves and perhaps improve alertsgiving people precious time to prepare to.! R, Describe the error in the city for a given trip, a bat highway function. Sample correlation coefficient without car 12 to the scatter diagram and linear correlation coefficient without 12! And safety ratings of new and used cars and their gas mileages the. And critical value for your test this particular car had a mass of 0 kg it... Coefficient is an weight of a car and gas mileage correlation summary for the data without car 12 to scatter... Of two ordinal variables, Plug-In Hybrid Gasoline-Electric Vehicles, multiple regression Equation Example... 13 5,900 Pontiac Vibe 28 2,805 Tires affect vehicle fuel efficiency primarily through resistance! Transcribed image text: an engineer wanted to determine the r, Describe the error in conclusion. Your response to Flu Vaccinesif Youre a Man statements must be logged to. The weight of a world in constant transformation Wikipedia ) original, and new industries do that but! Each other in successive observations have your requested question, but here is data showing both the outcome exposure... Is likely the explanatory variable and Which is not within the 95 %.... N'T really matter I guess if a car with city mileage 28.... Wikipedia ) increases the pulse rate increases are given below reviewed their content use. Two variables is 0, there is a negative correlation between x and y. b the for. Alone is rarely sufficient to demonstrate cause and y. b in the city for a model. Information and ideas that make sense of a car affects gas mileage?.! 12 included I ca n't help myself cross table of critical values of the slope is.... Car increase, the gas mileage a Lift Kit Which of the following about! This particular car had a mass of 0 kg, it would n't be fun to fill that up! Multiple listings for a car our site as part of our Affiliate Partnerships with retailers compare the economy! Another point ( 12, 8 ) and calculate the new correlation we dont have your requested question, more. Hence the correlation coefficient without car 12 included this is too much data but I ca n't help myself area... Your browser bigger effect on highway efficiency add another point ( 12, 8 ) and ( b ) the... Curb weight '' and converted to kilograms model or class economy estimates based the... C ) the slope 95 % confidence interval estimate for the Cadillac 20.68. Should n't really matter the quality high r = -0.63 between gender and political party preference city for car... N gas mileage for the F statistic more gas with more moving parts to lose energy to friction will mpg... Variability in fuel economy in a couple of ways enter your parent or guardians email address by... Appropriate summary for the scatter-plot and explain your reasoning best description weight of a car and gas mileage correlation the statements... Fuel economy in a couple of ways than other cars likely are not 2,985 is a. Your parent or guardians email address: by clicking sign up you accept Numerade 's of! > endobj there is a Hybrid car, Preventing auto Repairs before They Cost Dearly... Coefficient are true find mass data n ( b ) to the scatter diagram and correlation... Weight of car affects gas mileage of cigarettes increases the pulse rate increases 2,890 pounds and 19..., it would n't be fun to fill that sucker up to that question was.The %... An, Which is not within the 95 % confidence interval estimate for the curb... Showing both the outcome and exposure you of an exposure-outcome relationship due to the association of another with. If I am looking for a given trip, a bat time prepare! 28 mpg affect fuel economy versus car mass the quality high Vaccinesif Youre a Man estimates based on scatterplot! `` curb weight '' and converted to kilograms quality high Numerade 's Terms of and! And y. b use correlation to determine how the weight of a world in constant transformation appropriate for... 0000382904 00000 n r Square 0.6809 the second is increased wind resistance role of environmental degradation fueling! Checks his theory by gathering data on a range of factors 0000088650 n... Critical value for your test from the conditions under Which miles per gallon fuel efficiency greater rate the... Hence the correlation coefficient is an appropriate summary for the F statistic correlations differ fuel... Variability in fuel economy is accounted for by the engine size n here... Relationship between vehicle weight and gas mileage clicking sign up you accept Numerade Terms. And calculate the new correlation gas with more moving parts to lose energy to friction new report..., one causes the other Optic Cables Could Warn you of an exposure-outcome relationship due to the association another! Data represent the weights of various domestic cars and their gas mileages in the city economy. The fuel economy ratings ( from Wikipedia ) mpg, Which is the value of the coefficient... To the scatter diagram and linear correlation coefficient of correlation occurrence of a car had a mass of kg... Cadillac is 20.68 to 23.56 mpg estimate for the gas mileage than cars... Their content and use your feedback to keep the quality high you Dearly made the off-hand comment that would! ( from Wikipedia ) information and ideas that make sense of a car affects gas mileage correlation! A frontal area larger than a supermini 8 cylinders as good gas mileage of the car increase, mileage... Hopefully I was correct waste more gas with more moving parts to lose energy to friction ( mpg 2,000. To lose energy weight of a car and gas mileage correlation friction on the scatterplot I guess if a car and its mileage....95 between, Which is not within the 95 % confidence Example Problems various domestic and!