A random sample of 25 observations is selected from a normally distributed population. The sample variance is 10. In the 95% confidence interval for the population variance, the upper limit will be:
A) 17.110
B) 6.097
C) 17.331
D) 19.353
E) 11.842

Question

Quizplus · Accepted Answer

The upper limit of the confidence interval for the population variance is calculated using the chi-square distribution. With 24 degrees of freedom (n-1) and a 95% confidence level, the chi-square value for the upper limit is approximately 12.401. The upper limit is calculated as (24 * 10) / 12.401 = 19.353.

A Random Sample of 25 Observations Is Selected from a Normally