A sample of 28 elements is selected to estimate a 95% confidence interval for the variance of the population. The χ²values to be used for this interval estimation are _____. A) -1.96 and 1.96 B) 14.573 and 43.195 C) 16.151 and 40.113 D) 15.308 and 44.461

Question

Quizplus · Accepted Answer

The correct χ^2 values for a 95% confidence interval for the variance when the sample size is 28 (degrees of freedom = 27) are found in the χ^2 distribution table. The values 14.573 and 43.195 correspond to the lower and upper critical values for 27 degrees of freedom at a 95% confidence level.

A Sample of 28 Elements Is Selected to Estimate a 95