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 H_a,

(b) Find the critical value(s) and identify the rejection region(s),

(c) Calculate d̅ and s_d,

(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.

Transcribed Image Text:

Participant Repetitions (using placebo) Repetitions (using Vitamin C) Participant Repetitions (using placebo) Repetitions (using Vitamin C 417 279 678 636 170 699 372 582 145 185 387 593 248 245 349 902 9 10 12 1314 15 363 258 288 526 180 172 278 159 122 264 1052 218 117 185