The variance of a sample of 81 observations is 64. The standard deviation of the sample is which of the following?
A) 9
B) 4,096
C) 8
D) 6,561

Name: The variance of a sample of 81 observations is 64. The standard deviation of the sample is which of the following? A) 9 B) 4,096 C) 8 D) 6,561
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Quizplus · Accepted Answer

The standard deviation is the square root of the variance, so the standard deviation of the sample is sqrt(64) = 8. Therefore, the best choice is C.

The Variance of a Sample of 81 Observations Is 64