Scatterplots and Regression

Describe the relationship between the variables.

• Strong positive correlation

• Weak positive correlation

• Strong negative correlation

• Weak negative correlation

Estimate the correlation coefficient.

• r=0

• r=-1

• r=1

• r=2

A perfect positive correlation has a correlation coefficient of ____. 

• 1

• -1

• 0

Describe the relationship.

• Strong positive correlation

• Strong negative correlation

• Weak positive correlation

• No correlation

Which of the following could be a possible line of best fit for the data?

• y = -5/2x + 20

• y = -x + 19

• y = x + 20

• y = 2/3x + 15 

What is the correlation between length of running start and distance of jump?

• positive:  the further you run the further you jump

• negative: the less you run the less distance of your jump

• positive: the further your running start the less your distance

Which scatter plot shows no relationship?

• Graph A

• Graph B

• Graph C

• Graph D

The linear regression equation for the data is  y = 1.5x + 12.  Interpret the slope of the equation.

• The slope is (0, 1.5).  It means that a pizza with 0 toppings will cost $1.50.

• The slope is 1.5.  It means that it costs $1.50 per topping.

• There are 1.5 toppings.

• There are 1.5 pizzas.

The table shown is comparing a person's foot length to their height in cm. What might the height of a person be with a foot length of 30 cm?

• 185 cm

• 180 cm

• 190 cm

• 192 cm

The table shown is comparing a person's foot length to their height in cm. Calculate a line of best fit.

• f(x) = 25.05x + 5.57

• f(x) = 5.57x + 25.05

• f(x) = -5.57x + 25.05

• f(x) = 5.57x - 25.05