Elmo likes music. He wondered if listening to music while studying will improve scores on an exam. Fifty students who were to take the midterm in a week agreed to be part of a study. Half were randomly assigned to listen to classical music while studying for the exam. The other half were told not to listen to any music while studying for the exam. A hypothesis test is to be performed to determine if the average scores of those listening to music while studying for the exam were higher than those who did not listen to any music while studying for the exam. Which of the following hypothesis tests should be​ used? A. a​ two-sample z-test.
B. a​ chi-square test.
C. a​ two-sample t-test.
D. a​ one-sample t-test.
E. a​ two-sample z-test for proportions.