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Find the test statistic value for two mean tests using equal variance formula.

In testing the equality of the two means below, what is the test statistic? (Use the equal variances formula)

 

Sample 1

Sample 2

Sample size

12

8

Sample mean

115

80

Sample variance

700

450

a.0.28
b.3.27
c.2.37
d.0.14

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