Question

A local restaurant wants to estimate the proportion of customers that are satisfied with the service and food. Which of the following

samples will likely not be blased because of random sampling?

A. As customers leave, have the manager flip a coin. If it is heads, have the customer fill out a survey. If it is tails, do not give the
customer a survey.

B. Have a survey included on the back of the receipt that customers can fill out.

C. Give customers a web address that has a survey and let them know that if they fill it out, the get a free dessert on their next visit.

D. Ask the first 100 customers of the day.

Answer 1

B

Explanation:

B. Having a survey included on the back of the receipt that customers can fill out is likely not biased because of random sampling. This method allows all customers who visit the restaurant the opportunity to participate in the survey, regardless of when they visit or other factors.

The other methods listed may be biased because they do not allow all customers an equal opportunity to participate in the survey. For example, Method A only allows certain customers to participate based on the outcome of a coin flip, and Method C only allows customers who visit the restaurant's website to participate. Method D only allows the first 100 customers of the day to participate.