Scatterplots Algebra

Select the statement that best describes the line.

• The line is the line of best fit.

• The line is NOT a line of best fit because it does not pass through two points.

• The line is NOT a line of best fit because it does not go through the middle of the data set.

• The line is NOT a line of best fit because it does not go through the origin.

Estimate the value of r:

• -0.7

• 0.35

• 0.89

• 1

As the age of the car increases, its value decreases. Which scatterplot represents this relationship?

• A

• B

• C

• D

You are analyzing a scatter plot that has a negative correlation. What is true of the of the x and y values?

• As x increases, y decreases

• As x increases, y increases

• As x decreases, y decreases

The linear regression equation is y = 61.93x - 1.79.  Identify the y-intercept of the equation.

• Y-Int = 61.93

• Y-Int = -1.79

• Y-Int = (0, -1.79)

• Y-Int = (0, 61.93)

A person travels by car.  They record their miles driven in a data table.  Calculate the linear regression equation of this data.

• y = 61.93x - 1.79

• y = -1.79x + 61.93

• y = 0.016x + 0.03

• y = 0.03x + 0.016

A restaurant sells pizza for the prices in the data table.  Calculate the linear regression equation of the data.

• y = 1.5x + 12

• y = 12x + 1.5

• y = 0.67x - 8

• y = -8x + 0.67

Estimate the correlation coefficient for this scatterplot. 

• r = -0.9

• r = 1

• r = 0.9

• r = -1

Estimate the correlation coefficient for this scatterplot.

• r = 1.2

• r = 0.89

• r = 0

• r = -0.89

Determine the Correlation Coefficient and decide whether it is weak, moderate, or strong.

• 0.80 weak

• 0.90 moderate

• 0.80 strong

• 0.90 strong