A random sample of n = 25 is obtained from a population with variance ?2, and the sample mean is computed to be x-bar = 70. Consider the null hypothesis H0: ? = 80 versus the alternative hypothesis H1: ? a. The population variance is ?2 = 225.,b. The population variance is ?2 = 900.,c. The population variance is ?2 = 400.,d. The population variance is ?2 = 600.

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