Correlations, Causations, Lines of Best Fit, R-Value

Estimate the y-intercept of the trend line by looking at the graph.

• 2
• 1.8
• 1.2
• 0

The red line represents the line of best fit for the scatter plot. How many ice cream sales are expected if the temperature is 90°?

• 55
• 0
• 103
• 100

What is the equation of the line of best fit?

• y= 6x + 2

• y = -2x +6

What is the equation of the line of best fit?

• y = -25x + 170

• y = -5/8x + 170

• y = 25x + 170

• y = 5/8x + 170

The scatter plot shows the relationship between the number of chapters and the total number of pages for several books. Use the trend line to predict how many pages would be in a book with 19 chapters. 

• 150 pages
• 170 pages
• 190 pages
• 210 pages

Identify any outliers.

• Outlier at x = 18

• Outlier at x = 12

• Outlier at x = 6

• There aren't any outliers in this graph.

The equation of the trend line
is  y= 1/2x +1. What does the x variable represent? 
   

• The number of laps
• The amount of time in hours
• The amount of time in minutes
• How long it takes to go 0 laps

The equation of the trend line
is  y= 1/2x +1
How many laps can a bicycle
make around the park in
23 minutes?    

• 44 laps
• 12 1/2 laps
• 23 laps

What ordered pairs would you use to find the slope for the trend line?

• (1,0) (6,8)

• (8,6) (0,1)