10.110 Stock Risks The closing prices of two common stocks were recorded for a period of 15 days. The means and variances are

a. Do these data present sufficient evidence to indi- cate a difference between the variabilities of the closing prices of the two stocks for the populations associated with the two samples? Give the p-value for the test and interpret its value.

b. Construct a 99% confidence interval for the ratio of the two population variances.

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X-40.33 40.33 s=1.54 = 42.54 $ = 2.96