Question

Sampling Methods: Classify the type of sampling method used.

A quality assurance person randomly selects one box of CD's coming off the production line and tests all of the CD's in that box for defects.

systematicstratified    clusternone of these

Does this qualify as a random sample?

YesNo    not enough information

Answer 1

Answer:

1.  a) Since, A quality assurance person randomly selects one box of CD's coming off the production line out of N box and tests all of the CD's in that box for defects then here we are using cluster sampling and also it is a random sample

b) The commissioner randomly selects 2 teams from all 30 MLB teams and has everyone on that team drug tested.

• here we are using cluster sampling and yes it is a random sample.

Note: Since in both cases population is divided in form of N groups and we are selecting one out of N and collecting information on all of them, here we are using cluster sampling,

And cluster sampling is a random sampling.