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 standard deviation?
A)18
B)4.73
C)22.40
D)324
E)6.76

Question

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 standard deviation?
A)18
B)4.73
C)22.40
D)324
E)6.76

Quizplus · Accepted Answer

The standard deviation is a measure of the amount of variation or dispersion of a set of values. It is calculated by taking the square root of the variance. In this case, since the variance is 22.40, the standard deviation is the square root of 22.40, which is approximately 4.73. Therefore, B is the best choice.

In a Hearing Test, Subjects Estimate the Loudness (In Decibels)