2. The manager of a Worst Buy Used Electronics Store wants to compare the effectiveness of two training methods for new salespeople; Method A and Method B. A group of 24 new employees was randomly divided into two (2) groups of size 12, and each group was trained using a different method. Each employee then worked a 40-hour work week. The summary statistics relating to the sales of each group during that week are summarized in the following table. Method A Method B $1200 $1400 Samle Standard Deviation $240 $200 (a) Let Population 1 represent all employees who could be trained with Method A, and let Population 2 represent all employees who could be trained with Method B. Based on the sample information above, does it appear that these population variances are equal or unequal? (b) Compute a 95% condence interval for the difference in average weekly sales of all employees who could be trained using these two training methods. Interpret the result within the context of the given scenario. Under what conditions is this procedure valid