Question

A school principal wanted to investigate student opinion about the food served in the school cafeteria. The principal selected at random samples of 50 first-year students, 50 second-year students, 50 third-year students, and 50 fourthyear students to complete a questionnaire. Which of the following best describes the principal's sampling plan?(A) A stratified random sample(B) A simple random sample(C) A cluster sample(D) A convenience sample(E) A systematic sample

Answer 1

The answer is A. Stratified random sample.

Step-by-step explanation:

Stratified random sampling follows the same logic as the simple random sampling, its goal is to gather a sample that would be representative of a population. But, unlike the simple random sampling, which involves selecting the sample out of the enitre population, when you conduct research with using stratified random sampling you first divide the entire population into smaller groups and select a sample of each group.

In this case, the principal first divided the population (students) into stratas based on the grade they attend, then he chose 50 students of each group.