(Answered) Recent studies have confirmed that there is a relationship

Economics

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?

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