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Amazon samples 50 shipments to estimate the mean costs for shipping/handling/postage. The sample mean is $25.45 with a standard deviation of $4.80. Using a 98%

Amazon samples 50 shipments to estimate the mean costs for shipping/handling/postage. The sample mean is $25.45 with a standard deviation of $4.80. Using a 98% confidence level for the mean S&H costs, calculate the interval

Please give me step-by-step instruction. I haven't taken Statistic in years

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