Testing the Difference Between Two Means In Exercises
15–24,
(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 z, (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 samples are random
and independent, and the populations are normally distributed.
21) Home Prices A real estate agency says...