Question

The scatter plot below shows how the number of posters sold each day at a museum is related to the cost per poster.

image

The museum manager drew the line of best fit on the scatter plot. Which statement best interprets the meaning of the y-intercept of the line of best fit?

A.
For each $1 increase in the price of the posters, about 1 more poster is sold.

B.
For each $1 increase in the price of the posters, about 1 fewer poster is sold.

C.
If the posters are free, about 40 posters are given away.

D.
If the posters cost $40 each, the number sold is about 0.

Answer 1

C

The y-intercept is the predicted number sold when the price (x) is 0, so it means if the posters were free, about 40 would be given away. Options A and B describe the slope; D describes the x-intercept.