Calculate the Standard Error for the Mean Difference A) 25105
B) 2

Calculate the standard error for the mean difference.
-An army depot that overhauls ground mobile radar systems is interested in improving its
Processes. One problem involves troubleshooting a particular component that has a high
Failure rate after it has been repaired and reinstalled in the system. The shop floor
Supervisor believes that having standard work procedures in place will reduce the time
Required for troubleshooting this component. Time (in minutes) required troubleshooting
This component without and with the standard work procedure is recorded for a sample of
19 employees. The standard error of the mean difference is $$\begin{array} { | c | c | c | } \hline \begin{array} { c } \text { Without } \\\text { Standard } \\\text { Work } \\\text { Procedure }\end{array} & \begin{array} { c } \text { With Standard } \\\text { Work } \\\text { Procedure }\end{array} & \begin{array} { c } \text { Difference } \\\text { Without - } \\\text { With }\end{array} \\\hline 142 & 119 & 23 \\\hline 144 & 118 & 26 \\\hline 153 & 126 & 27 \\\hline 148 & 119 & 29 \\\hline 146 & 121 & 25 \\\hline 149 & 125 & 24 \\\hline 138 & 116 & 22 \\\hline 145 & 120 & 25 \\\hline 153 & 124 & 29 \\\hline 160 & 138 & 22 \\\hline 163 & 135 & 28 \\\hline 170 & 144 & 26 \\\hline 169 & 142 & 27 \\\hline 151 & 128 & 23 \\\hline 152 & 131 & 21 \\\hline 167 & 141 & 26 \\\hline 164 & 140 & 24 \\\hline 165 & 140 & 25 \\\hline 163 & 138 & 25 \\\hline\end{array}$$

A) 25.105
B) 2.307
C) 0.529
D) 4.3589
E) None of the above.