Identify the type of sampling used random systematic stratif

Identify the type of sampling used (random, systematic, stratified, or cluster sampling) in the situation described below a man is selected by marking company to participation in a pained focus group the company says that the man was selected because his name is among the first 400 in the phone number Which type of sampling did the making company use? Convenience sampling Systematic sampling Started sampling Random sampling cluster sampling

Solution

It is an example of convenience sampling. Becuase company conveniently selected the man from starting 400 of the list. Company did not make starta or cluster. And it did not select the man from whole populaiton randomly. So option 1 is correct.