The Essential Difference Between a Confidence Interval Constructed Employing a Stratified

Multiple Choice

The essential difference between a confidence interval constructed employing a stratified sample and that constructed employing a simple random sample is that with the stratified sample

A) a point estimate of the population mean is not required.
B) determination of the estimate of the mean and standard error of estimate involves the use of weights.
C) the strata results are appropriately weighted by a method of curvilinear estimation.
D) inferences are drawn on the basis of the known population mean and variance.
E) the researcher does not need to specify the degree of confidence.