1. Find the critical values 2R and 2L for the given confidence level c and sample size n.

c=0.95, n=16

2R=

2. Find the critical values 2L and 2R for the given confidence level c and sample size n.

c=0.8, n=20

2L=

3. Find the critical values 2L and 2R for the given confidence level c and sample size n.

c=0.99, n=30

2L=

4. Use technology to construct the confidence intervals for the population variance 2 and the population standard deviation . Assume the sample is taken from a normally distributed population.

c=0.99, s2=10.24, n=25

The confidence interval for the population variance is ( , )

5. Use technology to construct the confidence intervals for the population variance 2 and the population standard deviation . Assume the sample is taken from a normally distributed population.

c=0.90, s=35, n=18

The confidence interval for the population variance is ( , )