Question: A consumer group compared the reliability of two comparable microcomputers from two different manufacturers. The proportion requiring service within the first year after purchase was

A consumer group compared the reliability of two comparable microcomputers from two different manufacturers. The proportion requiring service within the first year after purchase was determined for samples from each of two manufacturers.

Find a 0.95 confidence interval for p1 - p2

Manufacture pl Size Proportion Needing Service 75 75 0.15 0.09 2

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