Chapter 23, Problem 41E

Cereals A healthy cereal should be low in both calories and sodium. Data for 77 cereals were examined and judged acceptable for inference. The 77 cereals had between 50 and 160 calories per serving and between 0 and 320 mg of sodium per serving. Here’s the regression analysis:

Dependent variable is Sodium

R-squared = 9.0%

s = 80.49 with 77 – 2 = 75 degrees of freedom

1. a) Is there an association between the number of calories and the sodium content of cereals? Explain.
2. b) Do you think this association is strong enough to be useful? Explain.