Five Students Took a Math Test Before and After Tutoring

Essay

Five students took a math test before and after tutoring.Their scores were as follows. $$\begin{array} { c | c c c c c c } \hline \text { Subject } & \text { A } & \text { B } & \text { C } & \text { D } & \text { E } & \text { F } \\\hline \text { Before } & 69 & 68 & 73 & 69 & 65 & 78 \\\hline \text { After } & 73 & 77 & 71 & 72 & 77 & 82 \\\hline \text { B - A } & - 4 & - 9 & 2 & - 3 & - 12 & - 4 \\\hline\end{array}$$ Do the data suggest that the tutoring improves math scores? Conduct a Wilcoxon signed rank test using a 0.05 level of significance.