Cheese, Please! The demand for healthy foods that are low in fat and calories has resulted in a...

Cheese, Please! The demand for healthy foods that are low in fat and calories has resulted in a large number of “low-fat” or “fat-free” products. The table shows the number of calories and the amount of sodium (in milligrams) per slice for five different brands of fat-free American cheese.

Brand	Sodium (mg)	Calories
Kraft Fat Free Singles	300	30
Ralphs Fat Free Singles	300	30
Borden® Fat Free	320	30
Healthy Choice® Fat Free	290	30
Smart Beat® American	180	25

a. Should you use the methods of linear regression analysis or correlation analysis to analyze the data? Explain.

b. Analyze the data to determine the nature of the relationship between sodium and calories in fat-free  American cheese. Use any statistical tests that are appropriate.