Question: Given the data below, the number of aborted runs (fatal error in computer software),

a) Find the 90% confidence interval for the variance and standard deviation.

b) If a given standard deviation for a software your company intends to buy is inside the interval how would you explain such a situation to a system analyst who does not know any statistics so that he can decide (or not) on the purchase? (assuming that they would listen to a statistician!).

DATA: 2 4 1 3 3 5 6 2 1 3 1