A random sample of 25 nurses selected from a state registry yielded the following information on each nurse’s score on the state board examination and his or her final score in school. Both scores relate to the nurse’s area of affiliation. Additional information on the score made by each nurse on an aptitude test, taken at the time of entering nursing school, was made available to the researcher. The complete data are as follows:

State Board Score

(Y)

Final Score

(X1)

Aptitude Test Score

(X2)

440 87 92 480 87 79 535 87 99 460 88 91 525 88 84 480 89 71 510 89 78 530 89 78 545 89 71 600 89 76 495 90 89 545 90 90 575 90 73 525 91 71 575 91 81 600 91 84 490 92 70 510 92 85 575 92 71 540 93 76 595 93 90 525 94 94 545 94 94 600 94 93 625 94 73 Total 13,425 2263 2053