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Testing of Hypothesis

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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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The solution contains the determination of the test statistic for testing the equality of means.

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