To accumulate a sample of 500 telephone numbers,I decide to include every 20ᵗʰ telephone number in the local telephone directory beginning randomly with the letter "N." I have engaged in
A)simple random sampling.
B)snowball sampling.
C)systematic sampling.
D)stratified sampling.
E)quota selection

Question

Quizplus · Accepted Answer

The method used here is systematic sampling, as every 20th telephone number is selected from the directory. It is not simple random sampling because the selection is not completely random, and it is not snowball sampling, which involves starting with a small sample and gathering more participants through referrals. It is also not stratified sampling or quota selection, which involve dividing the population into groups and selecting participants in proportion to their representation in the population.

To Accumulate a Sample of 500 Telephone Numbers,I Decide to Include