Group 1 has a mean of 13.4 and group 2 has a mean of 15.2. Both populations are known to have a variance of 9.0 and each sample consists of 18 items. What is the test statistic to test for equality of population means?
A)-1.755
B)-1.643
C)-1.800
D)-1.285

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The Answer of Group 1 has a mean of 13.4 and group 2 has a mean of 15.2. Both populations are known to have a variance of 9.0 and each sample consists of 18 items. What is the test statistic to test for equality of population means?
A)-1.755
B)-1.643
C)-1.800
D)-1.285

Group 1 Has a Mean of 13