Scatter Plot, Trend Lines, and MAD

When the data closely resembles a line

• Strong Correlation

• Weak Correlation

• No Correlation

• Correlation

The data slightly resembles a line but is more spread out

• Strong Correlation

• Weak Correlation

• No Correlation

• Correlation

A line drawn in a scatter plot to fit most of the dots and

shows the relationship between the two sets of data

• Association

• Causation

• Line of Best Fit

• Linear Regression

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 140 pages. 

• 12 chapters

• 19 chapters

• 14 chapters

• 21 chapters

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

• graph 1

• graph 2

• graph 3

• graph 4

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

A group of hikers is descending, and the elevation of several of the hikers after a certain number of minutes is shown in the scatter plot.

True or False:

The graph shows a negative association.

• True

• False

Write the equation of the trend line in slope-intercept form.