Exhibit 13-11
Below You Are Given a Partial Computer Output

Multiple Choice

Exhibit 13-11
Below you are given a partial computer output based on a sample of 25 observations.
$\begin{array}{lcc}&\text { Coefficient }&\text { Standard Error }\\\text { Constant } & 145 & 29 \\\mathrm{X}_{1} & 20 & 5 \\\mathrm{X}_{2} & -18 & 6 \\\mathrm{X}_{3} & 4 & 4\end{array}$
-Refer to Exhibit 13-11. We want to test whether the parameter ?2 is significant. The test statistic equals

A) 4
B) 5
C) 3
D) -3