An investigator wishes to estimate the proportion of Type II diabetic patients who take insulin to manage their diabetes. A large, national database of Type II diabetic patients is used to generate the estimate. The database involves a random sample of 1200 Type II diabetic patients, 423 of whom report taking insulin to manage their diabetes.
a. Compute a point estimate for the proportion of all Type II diabetics who take insulin to manage their diabetes.
b. Compute the standard error of the point estimate
c. Compute 95% confidence interval for the proportion of all Type II diabetics who take insulin to manage their diabetes.