After the ﬁrst exam in a statistics course, Professor Katula surveyed 14 randomly selected students to determine the relation between the amount of time they spent studying for the exam and exam score. She found that a linear relation exists between the two variables. The least-squares regression line that describes this relation is y-har = 6.3333x + 53.0298.
(a) Predict the exam score of a student who studied 2 hours.
(b) Interpret the slope.
(c) What is the mean score of students who did not study?
(d) A student who studied 5 hours for the exam scored 81 on the exam. Is this student’s exam score above or below average among all students who studied 5 hours?