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3. The breaking strengths in pounds of five specimens of manila rope of diameter 16 inch were found to be 660, 460, 540, 580, and

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3. The breaking strengths in pounds of five specimens of manila rope of diameter 16 inch were found to be 660, 460, 540, 580, and 550. (a) Estimate the mean breaking strength by a 95 percent confidence interval assuming normality. (b) Estimate of by a 90 percent confidence interval

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