Scatter Plots and Trend Lines

About how many male math teachers were there in 2006?

• 15

• 30

• 35

• 45

A small theme park is trying to determine the number of guests they should expect on a weekend, based on the temperature outside.  Based on the trend line, about how many guests should be expected if the temperature is around 80°?

• 8,300

• 8

• 7,300

• 9,300

A teacher made the following graph showing absences vs. final grades.  Predict the grade of a student that has 7 absences.

• 45

• 50

• 60

• 70

The graph shows a line of best fit for data collected on the value of used cards in relation to the number of  years since they were purchased.  What is the equation of the line of best fit?

• y = 750 x + 9500

• y = - 750 x +11000

• y = (3/4) x + 11

• y = - (3/4) x + 11000

A teacher made the following graph showing the number of hours that a student studied for an exam versus their exam grade. Predict the grade of a student if they studied for 3.5 hours.

• 70

• 90

• 80

• 60

What type of association does this graph have?

• positive

• negative

• none

• all of the above

Which of the following lines represents the trend line for the scatter plot?

• A

• B

• C

• D

Which sentence describes the relationship shown on this scatter plot?

• 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

What type of association does this scatter plot show?

• positive linear association

• negative linear association

• no association

• nonlinear association

identify the outlier

• 30, 100

• 100, 30

• there is no outlier