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?
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.