#1 What distribution must be used when computing confidence intervals for variances and standard deviations?

#2 What assumption must be made when computing confidence intervals for variances and standard deviations

#10. A random sample of stock prices per share (in dollars) is shown. Find the 90% confidence interval for the variance and standard deviation for the prices. Assume the variable is normally distributed.

26.69 13.88 28.37 12.00

75.37 7.50 47.50 43.00

3.81 53.81 13.61 45.12

6.94 28.52 28.00 60.50

40.25 10.87 46.12 14.75