A nutritionist was interested in developing a model that describes the relation between the amount of fat (in grams) in cheeseburgers at fast-

food restaurants and the number of calories. She obtains the following data from the Web sites of the companies.

(a) The researcher wants to use fat content to predict calories. Which is the explanatory variable?
(b) Draw a scatter diagram of the data.
(c) Compute the linear correlation coefficient between fat content and calories.
(d) Does a linear relation exist between fat content and calories in fast-food restaurant sandwiches?

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Sandwich (Restaurant) Quarter-pound Single with Cheese (Wendy's) Whataburger (Whataburger) Cheeseburger (In-n-Out) Big Mac (McDonald's) Quarter-pounder with cheese (McDonald's) Whopper with cheese (Burger King) Jumbo Jack (Jack in the Box) Double Steakburger with cheese (Steak 'n Shake) Fat Content (g) Calories 20 39 27 29 430 750 480 540 26 510 47 760 35 690 38 632