A Group Was Tested to See How Many Sit-Ups Could

Short Answer

A group was tested to see how many sit-ups could be executed in 30 seconds. They were tested on Wednesday and again on Friday to check the reliability of the scores. Calculate the correlation coefficients for the two sets of sit-up scores.
$$\begin{array} { | l | l | l | l | } \hline \text { Student } & \boldsymbol { X } & \boldsymbol { Y } & \\\hline & & & \\\hline 1 & 37 & 35 & \\\hline 2 & 33 & 40 & \\\hline 3 & 30 & 37 & \\\hline 4 & 26 & 30 & \\\hline 5 & 25 & 23 & \\\hline 6 & 24 & 22 & \\\hline 7 & 21 & 30 & \\\hline 8 & 20 & 18 & \\\hline 9 & 17 & 20 & \\\hline 10 & 25 & 38 & \\\hline\end{array}$$