If the probability of Caesarean birth is 0.30, and 140 in a sample of 500 births are Caesarean

Finding P-Values and critical values. In exercise 17-24, assume that the significance level is a=0.05; use the given statement and find the P-value and critical values.

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.