Finding P-Values and Critical Values. In Exercises 17-24, assume that the signifi- cance level is a = 0.05; use the given statement and find the P-value and critical values. (See Figure 8-4.) 18. The test statistic of z =-2.00 is obtained when testing the claim that p < 0.5. 20. The test statistic of z 1.50 is obtained when testing the claim that p 0.25. 24. With H: p > 7/8, the test statistic is z = 2.88.

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