Construct a 90 confidence interval for the population, Ask an Expert

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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?

3.What is the standard deviation of the sampling distribution?

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