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In testing the equality of the two means below, what is the test statistic?

In testing the equality of the two means below, what is the test statistic?  (Use the unequal variances formula)
Sample 1 Sample 2
Sample size 9 12
Sample mean 80 115
Sample variance 550 100
A)  -4.20    B)  -2.31    C)  -0.18    D)  -0.50

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