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
The solution provides step by step method for the calculation of independent sample t test for mean under unequal variance assumption. Formula for the calculation and Interpretations of the results are also included.