A Random Sample of Patients Who Attended a Clinic Was

Multiple Choice

A random sample of patients who attended a clinic was selected. The age of the patient (years) and the number of days since the last visit were collected and are displayed in the figure below. The least-squares regression line for predicting number of days since the last visit from the age of the patient is y = 600.081 - 8.694x. The slope of this line tells us the

A) correlation between age of patient and days since last visit.
B) change in days since last visit for each year older a patient is, on average.
C) change in the age of the patient for each extra day since the last visit.
D) average days since last visit for all of the patients.