An instructor gives a test before and after a lesson and results from randomly selected students are given below.
At the 0.05 level of significance, test the claim that the lesson has no effect on the grade. Use the sign test. $\begin{array}{llllllllllllllll}
\text { Before } & 54 & 61 & 56 & 41 & 38 & 57 & 42 & 71 & 88 & 42 & 36 & 23 & 22 & 46 & 51 \
\hline \text { After } & 82 & 87 & 84 & 76 & 79 & 87 & 42 & 97 & 99 & 74 & 85 & 96 & 69 & 84 & 79
\end{array}$

Question

Quizplus · Accepted Answer

The Answer of An instructor gives a test before and after a lesson and results from randomly selected students are given below.
At the 0.05 level of significance, test the claim that the lesson has no effect on the grade. Use the sign test. $\begin{array}{llllllllllllllll}
\text { Before } & 54 & 61 & 56 & 41 & 38 & 57 & 42 & 71 & 88 & 42 & 36 & 23 & 22 & 46 & 51 \
\hline \text { After } & 82 & 87 & 84 & 76 & 79 & 87 & 42 & 97 & 99 & 74 & 85 & 96 & 69 & 84 & 79
\end{array}$

An Instructor Gives a Test Before and After a Lesson