Compute a 98% condience interval for the population variance when the sample variance is 20 for a sample of 10

1. Compute a 98% condience interval for the population variance when the sample variance is 20 for a sample of 10 items frm a normal population.
a. 8.308 to 86.207
b. 7.476 to 77.512
c. 8.617 to 78.125
d. 7.755 to 70.313


2. Ho does the width of the interval respond to the changes in the confidence interval?
a. The width of the interval decrease with an increase in the confidence interval.
b. The width of the interval increases with an increase in the confidence interval.
c. The width of the interval is halved with the increase in the confidence interval.
d. The width of the interval is doubled with the decrease in the confidence interval.