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The manager of a company is worried about the morale of her employees. In order to determine if a problem in this area exists, she
The manager of a company is worried about the morale of her employees. In order to determine if a problem in this area exists, she decides to evaluate the attitudes of the employees with a standardized test of job satisfaction which is known to have a normal distribution with a standard deviation of 22 points. How large a sample of employees is needed in order to estimate the mean of all employees using a 99% confidence interval with a length of 6.8 points?
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