The scatterplot shows the age in years and the number of hours of sleep for some college men (M) and women (F).
a. How do we interpret the fact that both lines have a negative slope?
b. How do we interpret the fact that the slopes are the same for both lines?
c. How do we interpret the fact that the lines are nearly the same?
d. Why is the line for the men shorter than the line for the women?

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