Question: Suppose that you are testing the hypotheses H0: p = 0.20 vs. HA: p 0.20. A sample of size 250 results in a sample

Suppose that you are testing the hypotheses H0: p = 0.20 vs. HA: p ≠ 0.20. A sample of size 250 results in a sample proportion of 0.25.

a) Construct a 95% confidence interval for p.

b) Based on the confidence interval, at α = .05 can you reject H0? Explain.

c) What is the difference between the standard error and standard deviation of the sample proportion?

d) Which is used in computing the confidence interval?

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