Question

Dr. Olson is comparing the performance of the class on the two midterms. On the first midterm the average was 70 and the scores ranged from 28 to 99, with several scores in the 40's and 80's. For the second midterm, the average was also 70 but now there were a few scores in the 60's and 80's but most were in the 70's. Which of the following is TRUE about the class' performance?

A. Increased Variability
B. Decreased Variability
C. No Change in Variability
D. Experimental Design

Answer 1

Compared to the first midterm where scores ranged widely, the second midterm had most scores clustered around the average, indicating decreased variability in student performance.

Step-by-step explanation:

Dr. Olson is comparing the performance of the class on the two midterms. On the first midterm, the scores ranged widely from 28 to 99, which indicates a high level of variability in student performance. For the second midterm, while the average remained the same at 70, most scores were clustered around the average in the 70's, with only a few scores in the 60's and 80's.

This suggests that there was decreased variability in student performance on the second midterm compared to the first midterm.