SAT Scores for Students Selected Randomly from Two Different Schools

Essay

SAT scores for students selected randomly from two different schools are shown in the table.At a significance level of 0.05,does the Wilcoxon rank sum test provide evidence of a difference between the two schools? $$\begin{array} {ccc|ccc} &{ \text { School A } } & &&{ \text { School B } } \\\hline 550 & 480 & 670 & 460 & 580 & 620 \\400 & 700 & 520 & 380 & 680 & 570 \\540 & 740 & 560 & 660 & 500 & 480 \\360 & 560 & 650 & & 600 & 550\end{array}$$