Correlation and Predicting on Scatter Plot

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 chapters would be in a book with 180 pages. 

• 12 chapters

• 15 chapters

• 18 chapters

• 21 chapters

What type of correlation does this scatter plot show?

• positive

• negative

• no correlation

• nonlinear association

Is this line an accurate line estimate of best fit for the data?

• Yes

• No

Predicting the number of days to finish when you read 40 pages is an example of:

• Interpolation

• Extrapolation

• An outlier

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.

This means to predict a value inside the known values on a graph.

• trend line

• interpolation

• extrapolation

• causation

If r = -1, the correlation is

• Negative and Perfect

• Negative and Weak

• Positive and Weak

• Positive and Perfect

What is a Trend line?

• A line on a scatter plot that shows a correlation.

• A line showing the relationship between 2 sets data most accurately

• When 2 sets data are not related.

• Predicting a value OUTSIDE the range of known values.

What is a line of best fit?

• A line on a scatter plot that shows a correlation.

• A line showing the relationship between 2 sets data most accurately

• When 2 sets data are not related.

• Predicting a value OUTSIDE the range of known values.

When r = 1, the correlation is

• Positive

• Negative

• No Correlation

• Strong