Six Second-Graders Tried Tossing a Ball into a Basket Ten

Multiple Choice

Six second-graders tried tossing a ball into a basket ten times each. Their teacher then suggested a different way of tossing the ball, and the six students tried again. The number of successful tosses,
Before and after the teacher's suggestion, are shown below. $$\begin{array} { c | c c c c c c } \text { Student } & \mathbf { A } & \mathbf { B } & \mathbf { C } & \mathbf { D } & \mathbf { E } & \mathbf { F } \\\hline \text { Before the suggestion (out of 10) } & 2 & 4 & 5 & 2 & 5 & 4 \\\text { After the suggestion (out of 10) } & 4 & 4 & 2 & 4 & 2 & 4\end{array}$$ Compute S, the test statistic for a signed-rank test.

A) S = 2
B) S = 6
C) S = 7
D) S = 3