A random sample of 20 observations is selected from a normally distributed population.The sample variance is 12.In the 95% confidence interval for the population standard deviation, the upper limit will be:
A) 2.634.
B) 2.750.
C) 4.747.
D) 5.060.

Question

Quizplus · Accepted Answer

The upper limit of the confidence interval for the population standard deviation is calculated using the chi-square distribution. With 19 degrees of freedom (n-1) and a sample variance of 12, the upper limit is approximately 5.060.

A Random Sample of 20 Observations Is Selected from a Normally