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Problem: Suppose that you are testing the hypotheses H0: p = .20 vs. HA: p ? .20. A sample of size 250 results in a sample proportion of .25.

Required:

Question 1: Construct a 95% confidence interval for p.

Question 2: Based on the confidence interval, at a = .05 can you reject H0? Explain.

Question 3: What is the difference between the standard error and standard deviation of the sample proportion?

Question 4: Which is used in computing the confidence interval?

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