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85 recent graduates want to be certified engineers. On average, it took them 22 months, with a standard deviation of five months, to pass the

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85 recent graduates want to be certified engineers. On average, it took them 22 months, with a standard deviation of five months, to pass the Texas exam. Construct a 90% confidence interval for the sample mean of the prep time. ( , ) Round your answer to two decimal digits. Construct a 95% confidence interval for the sample mean of the prep time. ( , ) Round your answer to two decimal digits

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