7) Do heavier cars really use more gasoline? Suppose a car ischosen at random. Let x be the weight of the car (in hundreds ofpounds), and let y be the miles per gallon (mpg).264732 4723403452y2918231329172114Complete parts (a) through (e), given Ex = 301, Ey = 164, Ex2= 12,107, Ey? = 3,630, Exy = 5,736, andr= -0.9492.%3D(a) Draw a scatter diagram displaying the data.(b) Verify the given sums Ex, Ey, Ex², Ey², Exy, and the value ofthe sample correlation coefficient r.(c) Find x, and y. Then find the equation of the least-squares line3а + bx.(d) Graph the least-squares line. Be sure to plot the point (x, y)as a point on the line.(e) Find the value of the coefficient of determination r². Whatpercentage of the variation in y can be explained by thecorresponding variation in x and the least-squares line? Whatpercentage is unexplained?(f) Suppose a car weighs x = 38 (hundred pounds). What doesthe least-squares line forecast for y = miles per gallon?

Name: 7) Do heavier cars really use more gasoline? Suppose a car ischosen at
Uploaded: 2024-03-20T07:06:41.000Z
Channel: Bartleby
Description: 7) Do heavier cars really use more gasoline? Suppose a car ischosen at random. Let x be the weight of the car (in hundreds ofpounds), and let y be the miles per gallon (mpg).264732 4723403452y2918231329172114Complete parts (a) through (e), given Ex =