Bob samples 30 one-pound bags of celery hearts from the produce section at Kroger's. He weighs each bag and finds a sample mean of 1.4 pounds with a standard deviation of 0.2 pounds. Calculate the 90 % confidence interval for the true mean weight of the celery heart bags sold at Kroger's.

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Q: How large a sample should be selected to provide a 90% confidence interval with a margin of error of…

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Q: How large a sample should be selected to provide a 99% confidence interval with a margin of error of…

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