Matching Question The formula for the test statistic used for a two sample test of means where the population variances are unknown and unequal is: t = X1X2s12/n1+s22/n2 Match the variables to their description. Drag and drop application. s12 s12 drop zone empty. n1 n1 drop zone empty. t t drop zone empty. X 2 X2 drop zone empty. The t-distribution test statistic The size of sample one The variance of sample one The mean of sample two