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A gym is considering changing its operating hours at multiple locations in a city. The gym management wants to know what percent of its 4367 members would utilize the new hours of operation, so they plan to survey 500 members.

What is the best way to randomly choose these 500 members?


A. Enter all members' names into a computer software program that will randomly pick the 500 members.

B. Let the gym management decide which members should be surveyed.

C. Pick a letter from the alphabet and the first 500 members whose first or last name begins with that letter will be in the survey.

D. Choose the 500 members who have the highest attendance rates in the gym.


(I chose answer A, but hopefully i am correct.)

 Jun 6, 2018

Yes, Hev123, you are correct. By conducting a survey with a random sample, this avoids the possibility of receiving biased feedback from customers. 


If you let the gym staff decide, then it is possible to skew the data in a way that could negatively affect the business. 


Picking a letter may seem like it is just as effective as randomly selecting customers. However, many people who have a membership to a gym also have a membership with his or her brother or sister. This means that you will get several responses from the same group of people, which is not what the gym wants. 


If you choose the 500 members who have the highest attendance, then you will receive biased feedback. 

 Jun 6, 2018

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