A research in the university was studying the effect of motivation on sales at a particular kitchen appliance company. Of 20 salespersons randomly assigned to two groups, 10 were paid a commission and 10 an hourly rate. To determine whether there is a significance difference in the mean sales performance between salespersons on commission and salespersons paid an hourly rate, given a significance level of 5%, the consultant analyzed the data using Excel, with the output shown below. Sales data is assumed to be normally distributed and the population variances are unknown but assumed equal. t-Test: Two-Sample Assuming Equal Variances Commission Hourly rate Mean 249.8 227.6 Variance 536.6 232.7 Observations 10 10 Pooled Variance 384.67 Hypothesized Mean Difference 0 df 18 t Stat 2.531020715 P(T