A running coach wanted to see whether runners ran faster aftereating spaghetti t

Question

A running coach wanted to see whether runners ran faster aftereating spaghetti the night before. 18 random runners were chosenfor this study. They ran a 5 kilometer race after having a normaldinner the night before, and then a week later, reran the same raceafter having a spaghetti dinner the night before. Their results (inseconds) are in the table below. At = .01, what is the test valueto use for this test? Regular Dinner Spaghetti Dinner Difference by runner Sample mean 1100 1095 –5 Sample variance 3000 3000 450



a. –0.91

b. –0.24

c. –1.00

d. –0.06 Regular Dinner Spaghetti Dinner Difference by runner Sample mean 1100 1095 –5 Sample variance 3000 3000 450 Regular Dinner Spaghetti Dinner Difference by runner Sample mean 1100 1095 –5 Sample variance 3000 3000 450

Explanation / Answer

a.–0.91

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