https://www.scribd.com/document/472691965/assessment-of-learning-1-coursepack-3-pdf
https://youtu.be/WPLUZP_st-A?si=gV8eYRTG-12AARdj
https://youtu.be/gmbUAp4QZbU?si=2voMBV0Uz5Cna8XU
https://statistics.laerd.com/spsstutorials/pearsonsproduct-moment-correlation-using-spssstatistics.php