The y-intercept of the trend line y=-7.2x+98.9 represents the predicted average final grade when the number of hours spent on social media is 0. In other words, it is the average final grade for a student who spends 0 hours on social media.
Thus, if a student spends 0 hours on social media, the average final grade is predicted to be 98.9.
Your teacher surveyed the class to determine the number of hours that each student spent on social media. Your teacher created a table and scatterplot graph that displayed the number of hourse and the average final grade based on the hours. The trend line (equation) for the data is y=-7.2+98.9. Interpret the y=intercept. What is the average grade if a student was one social media for 0 hour?
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