For Exercises 23–25, do the following:
25. Test whether the population proportion is not equal to 0.4. A random sample of size 100 yields 55 successes. Let . For Exercises 26 and 27, do the following:
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(a) We have and . (b) (c) . Reject if or . (d) (e) Since , we reject . There is evidence that the population proportion is not equal to 0.4.