A company has claimed that the standard deviation of the monthly incomes of its employees is less than or equal to $120 . To test its claim, a random sample of 15 employees of the company was taken, and it was determined that the standard deviation of their incomes was $135 . At a 5% level of significance, test the company's claim
H0: ?2 ? 14400
Ha: ?2 > 14400 ?2 = 17.72 < 23.68
Do not reject H0, there is not sufficient evidence to refute the company's claim.
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