A large company has claimed that the standard deviation of the monthly incomes of their employees is less than or equal to $120 . To test their claim, a random sample of 76 employees of the company was taken; and it was determined that the standard deviation of their incomes was $135 . At 90% confidence, test the company's claim
H0: ?2 ? 14400
Ha: ?2 > 14400
chi-square = 94.92 > 91.06; p-value is between .05 and .1; reject H0
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