So let’s say you gave a certain test to your students. There were 30 questions on the test. They were all multiple-choice each with 5 choices. The test is ungraded but students are required to take the exam. The exam is used solely for evaluating the effectiveness of instruction.
Let’s say you plotted for each students “Test score” vs. “Time spent taking the test”. Let’s say the plot looked like this:
What do you make of it?
Equation of Best Fit: Score = (0.35 Points / Minute) * Time + 6.5
Correlation Coefficient: R = 0.71