Correlations and Line of Best Fit

Which of the following lines represents the line of best fit for the scatter plot?

• A

• B

• C

• There is no line of best fit for this graph because there is no trend.

Which type of correlation does C show?

• Positive correlation

• Negative correlation

• No correlation

Which type of correlation does A show?

• Positive correlation

• Negative correlation

• No correlation

A positive r-value shows a positive correlation.

• True

• False

What type of correlation does this graph have?

• positive

• negative

• none

• all of the above

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

The scatter plot below shows the number of books read by students in Mrs. Hall’s English class and their final grades. Which statement represents the best description about the line of best fit?

• The more books students read, the lower their English grade.

• The more books students read, the higher their English grade.

• The fewer books students read, the higher their English grade. 

• No relationship exists between the number of books students read and their English grades. 

440 turtles

• 440 turtles

• 40 turtles

• 150 turtles

• 90 turtles

Mr. Larson recorded the heights and arm spans of the students in his science class. The results are shown on the scatterplot. Using the scatterplot, which best predicts the arm span of a student who is 57 inches tall?

• 58

• 57

• 55

• Not enough information

The closer the r-value is to zero (0), the stronger the correlation.

• True

• False