=+36. An investigator wishes to estimate the difference between population mean lifetimes of two different brands of
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=+36. An investigator wishes to estimate the difference between population mean lifetimes of two different brands of batteries under specified conditions. If the population standard deviations are both roughly 2 hr and equal sample sizes are to be selected, what value of the common sample size n will be necessary to estimate the difference to within .5 hr with 95% confidence?
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Related Book For 
Applied Statistics For Engineers And Scientists
ISBN: 9781133111368
3rd Edition
Authors: Jay L. Devore, Nicholas R. Farnum, Jimmy A. Doi
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