A study was conducted using a random sample of Taco Bell products to determine whether grams of protein content (x) was related to calorie content (y). The following information was obtained: ŷ =...

A study was conducted using a random sample of Taco Bell products to determine whether grams of protein content (x) was related to calorie content (y). The following information was obtained:

ŷ = 402.3 – 0.508x,               Coefficient of determination (r²) = 53.14%

a.  What is the value of the correlation between protein content and calorie content (r)?

b.  If the product had 50 grams of protein, what is the calorie content?