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1: Which of the following statements about the hypothesis testing process is incorrect? A. B. c. The null hypothesis (Ho) and the alternate hypothesis (Ha) are mutually exclusive and exhaustive statements about a population parameter(s). The significance level (a) should be chosen before any data analysis is performed. The critical value approach specifies a range of values, also called the rejection region, such that if the value of the test statistic falls into this range, we do not reject the null hypothesis. The p-value is the likelihood of observing a sample mean that is at least as extreme as the one derived from the given sample. D. I 2: Which of the following statements about the hypothesis testing process is incorrect? A B. C. A critical value defines the beginning of a region of rejection of the Ho). The t-statistic is used in tests of means when the population variance is unknown. The z statistic is used in all tests of proportion and for tests of means when the population variance is known. Proper wording for a decision on the H, should state either "accept the null hypothesis" or "reject the null hypothesis." D