The owners of a waterpark are taking a survey to determine how many trips to the park kids in the area take during the summer. They take a survey of kids entering the park on a Monday. Is this a good sampling method?
A)Yes, by surveying kids at the entrance this will ensure that they get a large number of responses.
B)No, they should have surveyed kids on Friday and Saturday when more people come to the park.
C)No, many area kids may not come to the water park, they need a random sample of area kids.
D)No, they should have surveyed kids at the local high school.

Question

The owners of a waterpark are taking a survey to determine how many trips to the park kids in the area take during the summer. They take a survey of kids entering the park on a Monday. Is this a good sampling method?
A)Yes, by surveying kids at the entrance this will ensure that they get a large number of responses.
B)No, they should have surveyed kids on Friday and Saturday when more people come to the park.
C)No, many area kids may not come to the water park, they need a random sample of area kids.
D)No, they should have surveyed kids at the local high school.

anonymous · Answer

is it b?

anonymous · Answer

b is a good thought... you were thinking they miss a lot of people by focusing on a single day that isn't the busiest day.

However, I think it is actually D.

In the problem, they want to learn something about "kids in that area".  By sampling "kids already at the park", you actually miss a lot of kids in the area that aren't at the park on Mondays... or maybe NEVER at the park.