The mathematics department wishes to form a sample from each of 10 courses offered. They randomly select three individuals from each course and include them in the 30-person sample. Which of the following methods was used to select the probability sample? (A) Random

(B) Systematic

(C) Stratified

(D) Cluster

(E) Simple random

C) Stratified

Step-by-step explanation:

We know that the mathematics department wishes to form a sample from each of 10 courses offered. They randomly select three individuals from each course and include them in the 30-person sample.

We conclude that was used a stratified sample. That s a stratified sample because the population was first divided into 10 sections and then randomly select three individuals.

C) Stratified