In the formula for sample variance based on a sample of

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In the formula for sample variance based on a sample of size n, why is the sum of squares divided by n-1?

Select one:

a. Due to historic reasons.

b. So that the sample variance is an unbiased estimator of the population variance.

c. Because before calculators it was easier to divide by smaller numbers.

d. This is wrong and the sum of squares should be divided by n.

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