Question

A physical therapist claims that one​ 600-milligram dose of Vitamin C will increase muscular endurance. The table available below shows the numbers of repetitions 1515 males made on a hand dynamometer​ (measures grip​ strength) until the grip strengths in three consecutive trials were​ 50% of their maximum grip strength. At α=0.01 is there enough evidence to support the ​ therapist's claim? Assume the samples are random and​ dependent, and the population is normally distributed.

		Repetitions ​(using placebo)		Repetitions ​(using Vitamin​ C)
1		632		1074
2		759		1000
3		147		213
4		177		190
5		872		1264
6		790		1311
7		129		141
8		446		685
9		838		1258
10		290		458
11		877		944
12		174		281
13		719		878
14		151		194
15		328		457

1)Calculate sd (Round to one decimal place as​ needed.)

2)Calculate the test statistic (Round to one decimal place as​ needed.)

3)Decide whether to reject or fail to reject the null hypothesis and interpret the decision in the context of the original claim.

Answer 1

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