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Estimate difference in defective units from production lines

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Samples were taken of 400 units of each of the two production lines, X and W, of a manufacturing plant. The sample of the production line X had 40 defective units while the sample of line W had 80 defective units.

Estimate the difference in the fraction of defective units produced by the two lines with a confidence coefficient of 90%.

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The expert estimates differences in defective units from production lines. A Complete, Neat and Step-by-step Solution is provided in the attached file.

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