Part 1: Enjoying a beverage at Starbucks

A lot of nutritional information is available for the foods and beverages we consume. How exactly do the ingredients in food and beverages relate to each other? Let's examine this by focusing on the caloric and carbohydrate content of a random sample of Starbucks' beverages.

The number of calories and the number of grams of carbohydrates were recorded for a random sample of 50 different beverages from Starbucks. This data is shown in the scatterplot below. When a regression equation was constructed in order to predict grams of carbohydrates based on number of calories, the equation was as follows:

Predicted grams of carbohydrates = 1.80 + 0.16 (number of calories)

The correlation between number of calories and grams of carbohydrates is r = 0.93