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A statistician selected a sample of 20 HR managers from UAE companies. He reported that the...

A statistician selected a sample of 20 HR managers from UAE companies. He reported that the sample information indicated the average salary of all HR managers in UAE ranges from 17,500 Dhs and 19,500 Dhs and the sample standard deviation is 2200 Dhs. He neglected to report what confidence level he had used for building the t-based interval. Assuming that salaries are normally distributed and based on the above information, what is the confidence level?

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