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Construct A 90%90 \% Confidence Interval For (p1−p2)\left( p _ { 1 } - p _ { 2 } \right)

Question 18

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Construct a 90%90 \% confidence interval for (p1−p2)\left( p _ { 1 } - p _ { 2 } \right) when n1=400,n2=550,p^1=.42n _ { 1 } = 400 , n _ { 2 } = 550 , \hat { p } _ { 1 } = .42 , and p^2\hat { p } _ { 2 } =.63= .63 .

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