In given problem, give a 95% confidence interval for the variance of the population of billionaires' worth in dollars.
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.
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
Construct a 90% confidence interval for the average wealth in $ billions for the people on the Forbes list.