Scatter Plots and Linear Models

positive

negative

none

all of the above

Graph A

Graph C

Graph B

Graph D

A

B

C

D

A

B

C

D

Graph A

Graph B

Graph C

Graph D

Graph A

Graph B

Graph C

Graph D

As the temperature decreases, the visitors increase. 

As the temperature increases, the number of visitors increases. 

As the visitors increase, the temperature decreases. 

No correlation

$$y=\frac{2}{3}x+40$$

$$y=\frac{2}{3}x+70$$

$$y=20x+70$$

$$y=-\frac{1}{2}x+40$$

The penguins increase at a height of 6.8 per week.

A penguin's average height $$\frac{1}{2}$$ a week is 6 cm.

Penguin's increase at a height of 3 per week

On average penguins are born at 3 cm

On average penguins are born at 6.8 cm.

As the cost goes down, the number sold goes down.

As the cost goes up, the number sold goes down.

As the cost goes down, the number sold remains the same.

There is not relationship between cost and the number sold.