Out of 480 respondents in a recent health survey 42 reported ahistory of diabetes.
a. Estimate the true proportion of people with a history ofdiabetes with 95% confidence.
b. Using the survey data above, what should the sample size beif the researchers wanted to be accurate to within 2% of the trueproportion?
c. What should the sample size be if the researchers wanted tobe accurate to within 2% of the true proportion, assuming they hadno previous data?