algebra 1 “scatter plots” and “lines of fit”. scatter plots & lines of fit the points of...
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Algebra 1Algebra 1Algebra 1Algebra 1““Scatter Plots” and “Lines of Fit”Scatter Plots” and “Lines of Fit”
Scatter Plots & Lines of Fit• The points of a set of
real world data do not always lie on a line
• Sometimes you can draw a line that is close to all the points
• This graph represents the relationship between the year (x) and the number of Whooping cranes (y)
Scatter Plots:• Two sets of data plotted as
ordered pairs (Bivariate)• Here the 2 sets of data are:
Years (x) &
# of Whooping Cranes (y)• Scatter Plots are used to
investigate patterns in data
Analyzing Data :
• If the scatter plot is linear you can draw a line to summarize the data.
• This helps you to identify trends in the data.
• Also helps you identify the type of correlation.
• The year positively correlates to the number of Whooping Cranes.
Correlation:
• .
Correlation is like Slope• As the years progressed
(increased) the number of Whooping Crane grew (increased).
• This scatter plot shows a positive correlation in the data.
• Look at the Line of Fit and notice the positive slope
Is there a correlation?
Is there a correlation?
What (if any) is the correlation?
Exam the table. Determine what correlation, if any, exists in the data.
Sometimes math can be a little bit confusing
(photo from Poughkeepsie NY)
Okay Then, your turn
#1)
• Is there a correlation?
• What is it?
• What does it mean?
• TAKE A CHANCE Write an equation of the line of fit
#2)
• Is there a correlation?
• What is it?
• What does it mean?
• TAKE A CHANCE Write an equation of the line of fit
What (if any) is the correlation?
#3)
• Is there a correlation?
• What is it?
• What does it mean?
• TAKE A CHANCE Write an equation of the line of fit
What (if any) is the correlation?
Question Time
RAISE YOUR HAND if you
have any questions
about today’s lesson
Assignment:
Supplemental Handout
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