Georges asked five of his friends how long they studied for the last math test and what grade they received. He found a linear regression equation for the data to be y = 9.6x + 65.8. What does the 9.6 mean in the context of this equation?
Responses
A His friends on average studied 9.6 hours.His friends on average studied 9.6 hours.
B If they studied 9.6 hours they would get a 0 on the test.If they studied 9.6 hours they would get a 0 on the test.
C They should study 9.6 hours in order to get an A on the test.They should study 9.6 hours in order to get an A on the test.
D For every hour they studied their grade would go up 9.6 points.