Because of the Rising Costs of Industrial Accidents Many Chemical

Because of the rising costs of industrial accidents many chemical, mining and manufacturing firms have instituted safety courses. Employees are encouraged to take these courses, which are designed to heighten safety awareness. A company is trying to decide which one of two courses to institute. To help make a decision, eight employees take course 1 and another eight take course 2. Each employee writes a test, which is marked out of a possible 25. The results are shown below. Do these data provide sufficient evidence at the 5% level of significance to conclude that the marks from course 2 are higher than those of course 1? Assume that the scores are not normally distributed. $\begin{array} { | c | c | } \hline { \text { Safety Test Scores } } \\\hline \text { Course 1 } & \text { Course 2 } \\\hline 14 & 20 \\\hline 21 & 18 \\\hline 17 & 22 \\\hline 14 & 15 \\\hline 17 & 23 \\\hline 19 & 21 \\\hline 20 & 19 \\\hline 16 & 15 \\\hline\end{array}$