Question

In order to construct a confidence interval for the population variance, a random sample of n observations is drawn from a normal population. Use this information to find χ²_α/2,df and χ²_{1- α/2,df} under the following scenarios. (Round your answers to 3 decimal places. You may find it useful to reference the appropriate table: chi-square table or F table)

		χ2α/2,df	χ21- α/2,df
a.	A 95% confidence level with n = 18.
b.	A 95% confidence level with n = 30.
c.	A 99% confidence level with n = 18.
d.	A 99% confidence level with n = 30.

rev: 06_10_2019_QC_CS-170121

Answer 1

Solution-

A 95% confidence level with n = 18.

A 95% confidence level with n = 30

A 99% confidence level with n = 18.

A 99% confidence level with n = 30