A manufacturer of pharmaceutical products analyzes each batch of a product to verify the

Chapter 0, Problem 14.5

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A manufacturer of pharmaceutical products analyzes each batch of a product to verify the concentration of the activeingredient. The chemical analysis is not perfectly precise. In fact, repeatedmeasurements follow a Normal distribution with mean equal to the trueconcentration and standard deviation = 0.0068 grams per liter. Three analysesof one batch give concentrations 0.8403, 0.8363, and 0.8447 grams per liter. Toestimate the true concentration, give a 95% confidence interval for . Follow thefour-step process as illustrated in Example 14.3.14.6 IQ test scores. Here are the IQ test scores of 31 seventh-grade girls in a 4

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