A Study Was Conducted to Investigate the Effect of an Intervention

Multiple Choice

A study was conducted to investigate the effect of an intervention protocol on IQ tests.Nine randomly selected students were tested. $$\begin{array} { l c } \text { Before } & \text { After } \\100 & 106 \\111 & 112 \\93 & 95 \\92 & 90 \\99 & 107 \\85 & 100 \\117 & 126 \\110 & 105 \\98 & 110\end{array}$$
At ? = .05,test to determine if the protocol increases test scores.

A) Reject the null hypothesis.
B) Fail to reject the null hypothesis.
$\begin{array}{c}\begin{array}{l}\underline{\text { Before }}\\100 \\111 \\93 \\92 \\99 \\85 \\117 \\110 \\98 \end{array}\begin{array}{c}\underline{\text { After }} \\106 \\112 \\95 \\90 \\107 \\100 \\126 \\105 \\110 \end{array}\begin{array}{c}\underline{d}\\-6 \\-1 \\-2 \\2 \\-8 \\-15 \\-9 \\5 \\-12 \\\end{array}\begin{array}{c}\underline{ |d|}\\6 \\1 \\2 \\2 \\8 \\15 \\9 \\5 \\12\end{array}\begin{array}{c}\underline{\text { Rank }} \\ 5 \\1 \\2.5 \\2.5 \\6 \\9 \\7 \\4 \\8 \end{array}\end{array}$