Introduction to Statistics / MAT300 Spring 2014

Confidence interval for a population proportion

A researcher wants to estimate the proportion of depressed individuals taking a new anti- depressant drug who find relief. A random sample of 200 individuals who had been taking the drug is questioned; 148 of them found relief from depression. Based upon this, compute a 90% confidence interval for the proportion of all depressed individuals taking the drug who find relief. Then complete the table below.

Carry your intermediate computations to at least three decimal places. Round your answers to two decimal places.

(If necessary, consult a list of formulas.)