In a hearing test,subjects estimate the loudness (in decibels)of sound,and the results are (mean = 70): 68,67,70,71,68,75,68,62,80,73,68 What is the variance?
A)18
B)4.73
C)22.40
D)324
E)6.76

Question

Quizplus · Accepted Answer

Variance is calculated by finding the average of the squared differences from the mean. The squared differences from the mean (70) are: 4, 9, 0, 1, 4, 25, 4, 64, 100, 9, 4. The average of these squared differences is 22.40.

In a Hearing Test,subjects Estimate the Loudness (In Decibels)of Sound,and