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What is the Confidence Interval for the following numbers: a random sample of 143, mean of 21, standard deviation of 1.68, and confidence of 0.9

What is the Confidence Interval for the following numbers: a random sample of 143, mean of 21, standard deviation of 1.68, and confidence of 0.9 ? Level of difficulty = 1 of 2 Please format to 2 decimal places. Lower Confidence Limit: Upper Confidence Limit

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