THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:

The Quality Assurance Department of a large restaurant is attempting to monitor and evaluate customer satisfaction with restaurant services. Prior to their departure, a random sample of customers is asked to fill out a short questionnaire to rate such services as quality of food, price, waiting time to be served, and cleanliness of the place. The Quality Assurance Department prepares weekly reports that are used to improve the services.

In this restaurant services study, a listing of all customers in this restaurant over a particular week would constitute a:

Question $20$Select one:

A$.$

population.

B$.$

numerical variable.

C$.$

sample.

D$.$

process.