Question

A gym manager conducts a survey to find out if members prefer morning or evening gym dasses. She surveys the first 50 members to arrive at the gym each morning, and the results show that 70% of the memberssurveyed prefer morning gym classes. She condudes that about 70% of all members prefer morning gym classes.Which statement best describes the gym manager's conclusion?A Her conclusion is valid because she surveyed a large number of people.BHer conclusion is valid because the people she surveyed were randomly selectedСHer conclusion is not valid because she should have surveyed every gym member.DHer condusion is not valid because the group she surveyed does not represent members who go to the gym throughout the day

Answer 1

The gym manager only surveyed part of the population of the gym. She only surveyed the morning clients. Therefore, we can say that:

She needed a representative sample: Some people that go to the gym in the morning, in the afternoon, in the evening, that is, throughout the day. She doesn't need to ask the whole population to have a representative conclusion.

Therefore, the answer to this question is option D (described above).