A researcher studies the relationship between the number of hours of sleep per night and the performance on a
memory test. Study participants are randomly selected to
get no sleep or sleep in 1-hour increments, up to 8 hours
total (that is, the participant gets 1 hour, 2 hours, and so
on, up to 8 hours of sleep). The researcher determines
that the association between the two variables can be
modeled with the linear equation p = 9h + 15, where h is
number of hours of sleep and p is the percentage score
on the memory test. Use the slope in the equation to
describe the association between the hours of sleep and
the performance on the memory test.

ANSWER PLEAS !!