Assume that you're testing the hypotheses H0: p = .20 vs. HA: p ? .20. A sample of size 250 results in sample proportion of .25.
a. Develop a 95% confidence interval for p.
b. Based upon the confidence interval, at a = .05 can you reject H0? Describe.
c. Determine the difference between the standard error and standard deviation of sample proportion?
d. Which is employed in computing the confidence interval?