The historical data of Velvetta Inc., a healthcare products manufacturer, have shown that in a production process for filling bottles of shampoo, variance in the volume is constant; however, clogs in the filling machine often affect the mean volume. The historical standard deviation is 5 milliliters. In filling 250-milliliter bottles, a sample of 20 found a mean volume of 242 milliliters.     Velvetta Inc. Shampoo   Production Alpha Value 0.05 Standard Deviation 5 Sample Size 20 Sample Mean 242  Based on the data in the table above, calculate the margin of error at 95% confidence interval. Open an Excel sheet to work on this problem. Show labels

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