A physical therapist claims that one 600-milligram dose of Vitamin C will increase muscular endurance. The table shows the numbers of repetitions 15 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 = 0.05, is there enough evidence to support the therapist’s claim?
(a) Identify the claim and state H0 and Ha,
(b) Find the critical value(s) and identify the rejection region(s),
(c) Calculate and sd,
(d) Find the standardized test statistic t,
(e) Decide whether to reject or fail to reject the null hypothesis,
(f) Interpret the decision in the context of the original claim. Assume the samples are random and dependent, and the populations are normally distributed. If convenient, use technology. |

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