A government association claims that more than 44% of adults in the United States do volunteer work. You work for a volunteer organization and are interested in analyzing this claim. You find that in a random sample of 1165 adults, 556 do volunteer work. (Round numeric answers to 3 decimal places and/or the nearest tenth of a percent unless otherwise specified.)
You wish to construct a 90% confidence interval for the population proportion, p, in order to test the claim from a confidence interval point of view.
1. What is the best point estimate for p?
2.What is the critical value, zc for this estimate?