Psyc_315_-_Winter_2010_-_Class_7 - Recap of Last Class...

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1 1 Recap of Last Class • Z-Scores Steps for Finding Percentages from Scores Steps for Finding Scores from Percentages Practice Problems • Questions? Chapter 6 Relationships between two or more variables: Diagrams and Tables 3 Association Between Variables When we have two variables we can ask whether there is any relationship between scores on one variable and scores on a second variable. – Example: bdash2 Number of hours of studying and score on an exam. bdash2 Years of education and salary. bdash2 Parental anxiety and child anxiety. The correlation coefficient: “a bivariate statistic that measures the degree of linear association between two quantitative variables”.
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2 4 Bivariate Distributions and Scatterplots Scatter Plot bdash2 Graph that shows the degree and direction of the relationship between two numerical variables. bdash2 Horizontal axis bdash2 Usually the variable that does the predicting. bdash2 Vertical axis bdash2 Usually the variable that is predicted. 5 Graphing a Scatterplot 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 0 1 2 3 4 5 6 7 Amount of Studying (hrs) G P A Points on scatterplot may fall on a straight line Regression Line: line through the points of a scatterplot 4.1 6 3.9 5.6 3.5 4.3 3.3 4.0 3.1 3.7 3.0 3.4 2.8 2.2 2.1 1 Y X 6 How To Make A Scatterplot: Step 1 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 0 1 2 3 4 5 6 7 Amount of Studying (hrs) G P A
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  • Winter '10
  • AfroditiPanagopoulos
  • Pearson product-moment correlation coefficient, Scatter plot, Spearman's rank correlation coefficient, hrs

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