Prep-Work Problem 12.3

Company X is reviewing customer service scores from 20X1. Customer service scores range from 0-100. Company X has recently invested significant amounts of capital into reducing the variance in these customer service scores. Company X analyzed previous customer service scores and computed the variance. Company X determined it to be 2 = 250. Company X drew a random sample of customer service scores in 20X1. The results of this sample are as follows: 57 92 99 73 62 64 75 70 88 60

Can Company X conclude (at the 10% significance level) that the variability of customer service scores decreased during 20X1?

More importaint then the final answer, show all your work and explain how you got the answer.