Confidence interval for true population variance

Reference no: EM131431328

Fuel Consumption and Cars

New hybrid automobiles run on both gasoline and electricity. Toyota claims the Prius is capable of traveling 15 miles on electricity alone, and GM reports that the all-electric range of the 2013 Volt is 38 miles.38 A random sample of each automobile was obtained. All cars were fully charged, and the all-electric range for each was carefully measured. The data are given in the following table.

2169_tab 9.jpg

a. Find a 95% confidence interval for the true population variance in all-electric miles for the Volt.

b. Find a 95% confidence interval for the true population variance in all-electric miles for the Prius.

c. Is there any evidence to suggest that the two population variances are different? Justify your answer.

Reference no: EM131431328

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