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Algebra 1

Algebra 1. “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

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Algebra 1

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  1. Algebra 1 “Scatter Plots” and “Lines of Fit”

  2. 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)

  3. 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

  4. 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.

  5. Correlation: • .

  6. 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

  7. Is there a correlation?

  8. Is there a correlation?

  9. What (if any) is the correlation? Exam the table. Determine what correlation, if any, exists in the data.

  10. Sometimes math can be a little bit confusing (photo from Poughkeepsie NY)

  11. 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

  12. What (if any) is the correlation? #2) • Is there a correlation? • What is it? • What does it mean? • TAKE A CHANCE Write an equation of the line of fit

  13. 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

  14. Question Time RAISE YOUR HAND if you have any questions about today’s lesson

  15. Assignment: Supplemental Handout

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