You take a sample of 3 observations. For the first observation, the subject reports a test score of 88 , and said they spent 2 hours studying for the test. The next one reported a score of 84 , and said they spent 1 hour studying. The third subject reported a score of 92 , claiming 3 hours of study. If another subject told you they spent 5 hours studying, what is their predicted test score? Impossible to predict. Question 25 In a similar example to the above, with hours studying as the predictor of hours sleeping per day, your regression model predicts that a person who studied for 2 hours would sleep 8 hours. One of your many data points is from a subject who reported 2 hours of study and only 5 hours of sleep. What did that data point do to your total error? It did not change the error: Trick question, that data point would imvalidate your study. It added to error. It subtracted from error:.