Recent studies have confirmed that there is a relationship (r = -.43) between the average number of minutes someone spends text messaging during class and their final grade in that given class. Based on their data the following model was developed: y = 68 + (-.8)x. Using the above values answer the following question.
For each 15 minute increase in text messaging during class, how many points is a student's grade predicted to drop? Answer
What percentage of their grade change can be explained by text messaging in class?