Following Is a Sample of Five Matched Pairs $\begin{array}{llllll}\hline \text { Sample 1 } & 15 & 20 & 19 & 20 & 16 \\\text { Sample 2 } & 23 & 18 & 23 & 19 & 18 \\\hline\end{array}$

Multiple Choice

Following is a sample of five matched pairs.
$\begin{array}{llllll}\hline \text { Sample 1 } & 15 & 20 & 19 & 20 & 16 \\\text { Sample 2 } & 23 & 18 & 23 & 19 & 18 \\\hline\end{array}$

Let $\mu _ { 1 }$ and $\mu _ { 2 }$ represent the population means and let $\mu _ { \mathrm { d } } = \mu _ { 1 } - \mu _ { 2 }$ . A test will be made of the hypotheses $H _ { 0 } : \mu _ { \mathrm { d } } = 0$ versus $H _ { 1 } : \mu _ { \mathrm { d } } > 0$ . Compute the test statistic.

A) -1.222
B) -0.984
C) -0.547
D) -2.452