Scatter Plot Trend Lines and Predictions

Mrs. Collins made a scatterplot to show the relationship between the number of absences and a student’s final exam score. Based on this scatterplot, a student with 6 absences should get approximately what score on the final exam?

• 65

• 92

• 70

• 76

Choose the graph with a trend line that best fits the data.

• graph 1

• graph 2

• graph 3

• graph 4

Based on this scatter plot, a student with 6 absences should get approximately what score on the final exam? 

• ≅ 58

• ≅ 92

• ≅ 100

• ≅ 76

Which of the following would be a reasonable approximation for the length of time it would take this person to run 6 miles?

• ≅ 50 min

• ≅ 80 min

• ≅ 45 min

• ≅ 60 min

What is a line of best fit used for?

• To make predictions

• To make the graph look pretty

• To connect the points

Level 1: Determine the type of correlation.

• Positive

• Negative

• No Correlation

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

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

• 2

• 1.8

• 1.2

• 0

If a scatterplot has no correlation then...

• ...it has no ordered pairs

• ...it has ordered pairs that have a negative pattern

• ...its ordered pairs have no predictable pattern

• ...if it makes a lion on a graph (roar!)

About how many male math teachers were there in 2006?

• 15

• 30

• 35

• 45