A Confidence Interval Was Used to Estimate the Proportion of Statistics

question 151

Multiple Choice

A confidence interval was used to estimate the proportion of statistics students who are female.A random sample of 72 statistics students generated the following 90% confidence interval: (0.438,0.642) .Using the information above,what total size sample would be necessary if we wanted to estimate the true proportion to within $\pm$ 0.08 using 95% confidence?

• A)105
• B)150
• C)420
• D)597