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

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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