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Describe the scatterplot

Describe the scatterplot. Direction: Form: Strength:. Two –Variable Data Analysis. Source: 5 Steps to a 5 Book. Standard. Construct and interpret a scatterplot for a set of bivariate data. Vocabulary.

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Describe the scatterplot

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  1. Describe the scatterplot Direction: Form: Strength:

  2. Two –Variable Data Analysis Source: 5 Steps to a 5 Book

  3. Standard Construct and interpret a scatterplot for a set of bivariate data.

  4. Vocabulary • Scatter plot-Displays the relationship between two quantitative variables. Must label the x and y axis. The scale on x and y axis must be uniform. Use the whole grid given on AP test. • Explanatory Variable- explains or influences changes in a response variable(horizontal axis) • Response Variable- (vertical axis)measures an outcome of a study

  5. Scatterplots • Make a scatterplot of the time studying for test verses the test grade • Put this data in your calculator. What is the explanatory variable? What is the response variable?

  6. Interpreting a Scatterplot • Look for overall patterns and for striking deviations • Describe the direction, form, and strength of the relationship. • Direction: Positive, Negative, No Association • Form: Linear or Nonlinear • Strength: Strong, Moderate, or Weak • Look for outliers

  7. Association ( Directions) • Positive • Negative • No Association

  8. Linear relationship • Correlation Coefficent(r)- This measures the strength and direction of a linear relationship ( On AP free response-you must mention both) • The calculator will find r for you. However, we will do one example to let you see where the formula is coming from.

  9. Correlation (r) • Correlation Applet • http://www.rossmanchance.com/applets/guesscorrelation/GuessCorrelation.html

  10. Formula for r

  11. Example of How to calculate the “r”

  12. Continue • Make a scatter plot to determine the direction, strength, and form • Use your data to find r. • Show work-Then check with the calculator

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