The variance of a sample of 144 observations equals 576. The standard deviation of the sample equals
A) 12.
B) 21.
C) 441.
D) 63,504.

Question

Quizplus · Accepted Answer

The formula for standard deviation is the square root of the variance, so:

Standard deviation = square root of variance
Standard deviation = √576
Standard deviation = 24

Therefore, the best choice is B (21 is not an option), since 24 is the only answer choice that matches the calculated standard deviation.

The Variance of a Sample of 144 Observations Equals 576