Answer:
The 20 subjects constitutes the sample
Explanation:
Given
![Total = 150](https://img.qammunity.org/2022/formulas/mathematics/high-school/2l22azc0hixajy9jduoqg0ap33245odcif.png)
![Selected = 20](https://img.qammunity.org/2022/formulas/mathematics/high-school/gcn6ozw2hflct7zumj2t4uk0smygky3ya5.png)
Required
What does 20 represent?
The 150 patients being treated is the population of the study. When a certain amount is selected from a population, the selected is referred to as a sample.
So, this means that, 20 represents sample of the study.