During a Test Period,an Experimental Group of 10 Vehicles Using

Multiple Choice

During a test period,an experimental group of 10 vehicles using an 85 percent ethanol-gasoline mixture showed mean CO2 emissions of 240 pounds per 100 miles,with a standard deviation of 20 pounds.A control group of 14 vehicles using regular gasoline showed mean CO2 emissions of 252 pounds per 100 miles with a standard deviation of 15 pounds.A quick comparison of the sample variances suggests that the population variances are

A) probably equal.
B) probably unequal.
C) incomparable.