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Test your claim of a lower standard deviation

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Reference no: EM132035651

A manufacturing process yield steel ball bearings with a diameter that is normally distributed with a mean of 12.5mm and a standard deviation of 0.18mm. You suspect that an improvement to the process will reduce the standard deviation a random sample of 20 bearings had a mean of 12.6 and standard deviation of 0.13. Test your claim of a lower standard deviation at a 5% significance level this is all there is to add about the question

Reference no: EM132035651

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