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 hours and the average final grade based on hours. The trend line (equation) for the data is y = -7.2x + 98.9. Interpret the y- intercept. What is the average grade of the student was on social media for 0 hours
The y-intercept of the trend line, which is 98.9, represents the average grade of the student who spent 0 hours on social media. In this context, it means that the average grade of a student who did not spend any time on social media is 98.9.
The y-intercept of the trend line represents the value of y (average grade) when x (number of hours on social media) is equal to 0. In this case, the y-intercept of the trend line equation y = -7.2x + 98.9 is equal to 98.9.
Therefore, if a student spends 0 hours on social media, the average grade is expected to be 98.9.