Determine an approximate confidence interval

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Two spray-bottle rug cleaners were tested for their ability to remove a specific type of stain. The first was deemed successful in x = 37 out of nX = 70 independent trials and the second was judged successful in y = 62 out of nY = 85 independent trials. If pX (respectively, pY ) is the true proportion of times the first (respectively, the second) cleaner is successful at removing the specific stain, determine an approximate 95% confidence interval for pX - pY .

Reference no: EM13933448

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