Construct a 95% Confidence Interval For $\mu _ { 1 } - \mu 2$

question 87

Multiple Choice

Construct a 95% confidence interval for $\mu _ { 1 } - \mu 2$ Two samples are randomly selected from normal populations. The sample statistics are given below.
$\begin{array} { l l } \mathrm { n } _ { 1 } = 11 & \mathrm { n } _ { 2 } = 18 \\\overline { \mathrm { x } } 1 = 4.8 & \bar { x } _ { 2 } = 5.2 \\\mathrm {~s} _ { 1 } = 0.76 & \mathrm {~s} _ { 2 } = 0.51\end{array}$

• A) (-0.977,0.177)
• B) (-4.152,3.981)
• C) (-2.762,2.762)
• D) (-1.762,1.762)

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