8 a The manager of a company believes that differences in sales performance depends upon the salesperson's age. Independent samples of salespeople were taken and their weekly sales record is reported below. At 95% confidence, test the hypotheses (Use the Kruskal-Wallis test.). Below 30 Rank Between 30 to Rank Over 45 Rank years 45 years years No. of sales No. of sales No. of sales Select the test statistic and calculate its value