What is the variance for all of the participants?
A) 2.2
B) 2.8
C) 1.0
D) 4.9

Question

Quizplus · Accepted Answer

To find the variance, we first need to calculate the mean, which is (3+1+2+3+3+2)/6 = 2.5. Then, we subtract the mean from each data point, square the result, and take the average of those values. This gives us ((0.5)^2 + (-1.5)^2 + (-0.5)^2 + (0.5)^2 + (0.5)^2 + (-0.5)^2)/6 = 2.9167. Therefore, the variance is 2.9167, which is closest to 4.9 (choice D).

What Is the Variance for All of the Participants