A running coach wanted to see whether runners ran faster after eating spaghetti

Question

A running coach wanted to see whether runners ran faster after eating spaghetti the night before. A group of six runners was randomly chosen for this study. Each ran a 5 kilometer race after having a normal dinner the night before, and then a week later, reran the same race after having a spaghetti dinner the night before. The times for their races are shown in the table below. What test value should be used in a t test for these dependent samples?

Runner 1 Runner 2 Runner 3 Runner 4 Runner 5 Runner 6
Regular Dinner 991 s 976 s 1000 s 961 s 1007 s 987 s
Spaghetti Dinner 982 s 969 s 995 s 958 s 1006 s 988 s

A) 1.07 B) 2.62 C) 5.07 D) 2.07

Explanation / Answer

D) 2.07

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