The head of the quality control department at a publishing company is studying the effects of the type of glue and the type of binding on the strength of the bookbinding.The company has three possible glues to choose from and the book can either be bound as a paperback or a hardback.Many stacks of books are ready to be bound-some in paperback form,some in hardback form.As part of this study,45 books are to be randomly selected from each type of binding and then randomly assigned to one of the three types of glue.What type of sampling method is being used to select the books?
A)Simple random sample
B)Stratified sample
C)Multistage sample
D)None of the above

Question

Quizplus · Accepted Answer

The sampling method being used is stratified sampling because the books are first divided into two strata (paperback and hardback) and then within each stratum, a simple random sample of 45 books is selected.

The Head of the Quality Control Department at a Publishing