Mathematics, 28.02.2021 16:20 caro11377oxq5d0

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.

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During a test period, an experimental group of 10 vehicles using an 85 percent ethanol-gasoline mixt...