Load the classdata.xlsx datafile to answer this question. Using a 7% level of significance, test the null hypothesis that the average shoes sales across sales agents is 77 higher than the average coats sales across sales agents (treating the variables as being independent) against the two tailed alternative. We do not reject the null using the t test assuming equal variances since the pvalue is almost 10% and this is above 3.5%. We do not reject the null using the t test assuming unequal variances since the pvalue is 15%. We do reject the null using the t test assuming unequal variances since the pvalue is 5% and this is below 7%. We reject the null using the t test assuming equal variances since the pvalue is almost 3%.