Suppose that the sample of students described in the previous section was actually selected using stratified random sampling. In stratified sampling, the study population is divided into ...

A stratified lamellar composite build up was proposed using three shades (A2B, A1E, WE). A multi-shade composite is one where different composite layers are added in succession to provide a more ...

The following PROC SURVEYSELECT statements select a probability sample of customers from the Customers data set according to the stratified sample design. title1 'Customer Satisfaction Survey'; title2 ...