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 the hours. The trend line (equation) for the data is y = -7.2x + 98.9. Interpret the slope. How many points does the average final grade decrease for 1 hour on social media?
The slope of the trend line equation, -7.2, represents the rate of change in the average final grade for each additional hour spent on social media.
This means that on average, for every additional hour a student spends on social media, their average final grade decreases by 7.2 points.
Therefore, the average final grade decreases by 7.2 points for every 1 hour increase in time spent on social media.