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 sug a different way of tossing the ball, and the six students tried again. The number of succes tosses, before and after the teacher's suggestion, are shown below.
$\begin{array}{c|cccccc}\text { Student } & \mathbf{A} & \mathbf{B} & \mathbf{C} & \mathbf{D} & \mathbf{E} & \mathbf{F} \\\hline \text { Before the suggestion (out of 10) } & 2 & 3 & 7 & 2 & 7 & 3 \\\text { After the suggestion (out of 10) } & 3 & 3 & 5 & 3 & 5 & 3\end{array}$

Find the sum of the positive and negative rank sums as in a Wilcoxon signed-rank test. gested

A) positive rank sum = 7; negative rank sum = -3
B) positive rank sum = 6; negative rank sum = -2
C) positive rank sum = 4; negative rank sum = -2
D) positive rank sum = 2; negative rank sum = -1