The variance of a sample of 81 observations equals 64. The standard deviation of the sample equals
a. 9
b. 4096
c. 8
d. 6561
Answer: c. 8
The variance of a sample of 81 observations equals 64. The standard deviation of the sample equals
a. 9
b. 4096
c. 8
d. 6561
Answer: c. 8
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