Mathematics, 28.07.2021 01:00 Quantajah

During a test period, an experimental group of 10 vehicles using an 85 percent ethanol-gasoline mixture showed mean CO2 emissions of 667 pounds per 1000 miles, with a standard deviation of 20 pounds. A control group of 14 vehicles using regular gasoline showed mean CO2 emissions of 679 pounds per 1000 miles with a standard deviation of 15 pounds. At α = 0.05, in a left-tailed test (assuming equal variances) the test statistic is:. A. 1.321.
B. -2.508.
C. -2.074.
D. -1.717.

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