A researcher surveys 25 people and finds that their average commute is 15 minutes with a standard deviation of 1.5 minutes. Calculate the 95 percent confidence interval on variance. Do most people have a commute of 20 minutes? Confidence interval for variance? should I just use the variance instead of the standard deviation? so 1.5^2=2.25 root 25= 5 15+1.962.255 and 15−1.962.255 15+0.882 and 15−0.882 15.88,14.12 so, no , most people will not have a commute of 20 minutes Is this right? Thanks!