A sample of 21 elements is selected to estimate a 90% confidence interval for the variance of the population. The χ²value(s) to be used for this interval estimation is(are) _____. A) -1.96 and 1.96 B) 12.443 C) 10.851 and 31.410 D) 12.443 and 28.412

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The chi-square distribution with 20 degrees of freedom is used to construct a 90% confidence interval for the variance of the population. The critical values for this interval are 12.443 and 28.412.

A Sample of 21 Elements Is Selected to Estimate a 90