The marketing 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: = $37.2, and s = $6.8.
Suppose you want to perform a hypothesis test at a 1% significance level.
What is the conclusion of a test of whether the population variance differs from 35?