91Ó°ÊÓ

Twenty-two fourth-grade children were randomly divided into two groups. Group A was taught spelling by a phonetic method. Group B was taught spelling by a memorization method. At the end of the fourth grade, all children were given a standard spelling exam. The scores are as follows. $$ \begin{array}{l|cccccccccccc} \hline \text { Group A } & 77 & 95 & 83 & 69 & 85 & 92 & 61 & 79 & 87 & 93 & 65 & 78 \\ \hline \text { Group B } & 62 & 90 & 70 & 81 & 63 & 75 & 80 & 72 & 82 & 94 & 65 & 79 \\ \hline \end{array} $$ Use a \(1 \%\) level of significance to test the claim that there is no difference in the test score distributions based on instruction method.