Based on the fact that Rita picked a portion of the population for the study, this is a sample.
A sample is a smaller group of related variables that is derived from the larger group of related variables.
The larger group is called a population. Samples are very useful because they can represent the population and allow for research to be conducted at a lower cost.
In conclusion, this is a sample.
Find out more on samples at https://brainly.com/question/26113578.