For Exercises 19–22, do the following:
19. Test whether the population proportion exceeds 0.4. A random sample of size 100 yields 44 successes.
9.5.19
(a) We have and , so we can use the test for proportions. (b) . Reject if the (c) 0.82 (d) (e) Since the is not , we do not reject . There is insufficient evidence that the population proportion is greater than 0.4.