24. In Chapter 6, Problem 18, an educator evaluated the reliability of a test for mechanical aptitude that she had constructed. Two administrations of the test, spaced 1 month apart, were given to 10 students. The data are again shown here.

a. Calculate the value of Pearson r for the two administrations of the mechanical aptitude test.

b. Is the correlation signifi cant? Use 0.052 tail.
I/O

Student Administration 1 Administration 2 10 1 10 22 1 15 30 2 17 45 2 25 57 2 32 65 3 37 73 4 40 80 4 38 92 3 30 10 47 49