Sales A sample of 15 sales representatives was chosen to judge the effect of day of the week on their productivity. The firm monitored sales produced by each employee for Monday through Friday. (a) Is...

Sales A sample of 15 sales representatives was chosen to judge the effect of day of the week on their productivity. The firm monitored sales produced by each employee for Monday through Friday.

(a) Is there a statistically significant difference in sales across days of the week? Explain.

(b) Is the average level of sales on any one day statistically significantly different from sales on another day? Explain.