In problem 6–25, give a 95% confidence interval for the variance of the population of billionaires’ worth in dollars.

In problem The following is a random sample of the wealth, in billions of U.S. dollars, of individuals listed on the Forbes “Billionaires” list for 2007.8

2.1, 5.8, 7.3, 33.0, 2.0, 8.4, 11.0, 18.4, 4.3, 4.5, 6.0, 13.3, 12.8, 3.6, 2.4, 1.0