In Exercises 41 and 42, (a) identify the claim and state H0 and Ha, (b) find the critical value(s) and identify the rejection region(s), (c) find the standardized test statistic t, (d) decide whether to reject or fail to reject the null hypothesis, and (e) interpret the decision in the context of the original claim. Assume the population is
41. A fitness magazine advertises that the mean monthly cost of joining a health club is $25. You want to test this claim. You find that a random sample of 18 clubs has a mean monthly cost of $26.25 and a standard deviation of $3.23. At α = 0.10, do you have enough evidence to reject the advertisement’s claim?
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