The y-intercept of the trend line is the value of y when x=0. In this case, the y-intercept is 98.9.
Interpreting the y-intercept, it represents the predicted average final grade when a student spends zero hours on social media. In other words, it is the average grade for students who do not use social media at all.
If a student spends 10 hours on social media, we can use the trend line equation to predict their average final grade. Plugging in x=10 into the equation, we get:
y = -7.2(10) + 98.9
y = -72 + 98.9
y = 26.9
Therefore, the average grade if a student was on social media for 10 hours is predicted to be 26.9.
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 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 y -intercept. What is the average grade if a student was on social media for 10 hours?(1 point)
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1 answer