Question 803:

Asked on August 28, 2009

Tags: Variance

1

Answer:

No answer provided yet.To answer this question we need to know the formula for the sample variance. The variance is the square of the standard deviation. Both are measures which describe the average distance to the mean values take in a sample.

The sample variance is calculated as the the sum of squared deviations from the mean, divided by the degrees of freedom. The degrees of freedom in this case are n-1 = 4-1 =3. That would make the estimated population variance (using the sample variance as the estimate) equal to 12/3 = 4.