The Sales Manager of a Large Multinational Corporation Is Concerned $\bar { x }$

Essay

The sales manager of a large multinational corporation is concerned that some salespersons perform very well and others quite poorly.To help analyze the problem he draws a random sample of 20 salespersons,determines their commission incomes (in thousands of dollars),and calculates the following statistics: $\bar { x }$ = $37.2,and s = $7.8.Do these statistics provide sufficient evidence at the 5% significance level to conclude that the population variance exceeds $35 million²?