The following MINITAB output display presents a 95% confidence interval for the difference between two proportions. $\begin{array} { l r r c } \text { Sample } & \mathrm { X } & \mathrm { N } & \text { Sample P } \ 1 & 29 & 628 & 0.046178 \ 2 & 106 & 625 & 0.169600 \end{array}$

Difference $= p ( 1 ) - p ( 2 )$
Estimate for difference: $- 0.123422$
$95 \%$ CI for difference: $( - 0.152 , - 0.095 )$

What is the point estimate of $p _ { 1 } - p _ { 2 }$ ?
A) -0.123422
B) 0.215778
C) 0.108
D) 0.057

Question

The following MINITAB output display presents a 95% confidence interval for the difference between two proportions. $\begin{array} { l r r c } \text { Sample } & \mathrm { X } & \mathrm { N } & \text { Sample P } \ 1 & 29 & 628 & 0.046178 \ 2 & 106 & 625 & 0.169600 \end{array}$

Difference $= p ( 1 ) - p ( 2 )$
Estimate for difference: $- 0.123422$
$95 \%$ CI for difference: $( - 0.152 , - 0.095 )$

What is the point estimate of $p _ { 1 } - p _ { 2 }$ ?
A) -0.123422
B) 0.215778
C) 0.108
D) 0.057

Quizplus · Accepted Answer

The point estimate of $p _ { 1 } - p _ { 2 }$ is given in the output as $-0.123422$. Therefore, the correct answer is A) -0.123422. B, C, and D are incorrect as they are not the point estimate given in the output.

The Following MINITAB Output Display Presents a 95% Confidence Interval