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A manufacturer suspects a difference in the quality of the spare parts he receives from two suppliers. He obtains the following data on the service

A manufacturer suspects a difference in the quality of the spare parts he receives from two suppliers. He obtains the following data on the service life of random samples of parts from two suppliers. [10] supplier No. in sample Means Standard deviation A 50 160 10 B 100 163 5 Compute the 90% confidence interval estimate for difference between the two sample means

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