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Please explain and write clearly. The variance in drug weights is critical in the pharmaceutical industry....

Please explain and write clearly. The variance in drug weights is critical in the pharmaceutical industry. For a specific drug, with weights measured in grams, a sample of 18 units provided a sample variance of s2 = 0.36. a.Construct a 90% confidence interval estimate of the population variance for the weight of this drug. b.Construct a 90% confidence interval estimate of the population standard deviation.

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