A Study Was Conducted to Investigate the Effect of an Intervention

A study was conducted to investigate the effect of an intervention protocol on IQ tests.Nine randomly selected students were tested. $$\begin{array} { l c } \text { Before } & \text { After } \\100 & 106 \\111 & 112 \\93 & 95 \\92 & 90 \\99 & 107 \\85 & 100 \\117 & 126 \\110 & 105 \\98 & 110\end{array}$$
What is the rejection point T₀ for ? = .05?

A) 8
B) 6
C) 4
D) 6.5