Question: The data given below represent the calories and fat (in grams) of 16-ounce iced coffee drinks at Dunkin Donuts and Starbucks:

Product Calories Fat

Dunkin Donuts Iced Mocha Swirl latte (whole milk) 240 8.0

Starbucks Coffee Frappuccino blended coffee 260 3.5

Dunkin Donuts Coffee Coolatta (cream) 350 22.0

Starbucks Iced Coffee Mocha Espresso 350 20.0

(whole milk and whipped cream)

Starbucks Mocha Frappuccino blended coffee 420 16.0

(whipped cream)

Starbucks Chocolate Brownie Frappuccino blended coffee 510 22.0

(whipped cream)

Source: Extracted from Coffee as Candy at Dunkin Donuts and Starbucks, Consumer Reports, June 2004, p. 9.

a. Compute and interpret the coefficient of correlation, r.

b. At the 0.05 level of significance, is there a significant linear relationship between the calories and fat?