Psyc_315_-_Winter_2010_-_Class_7

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: b Number of hours of studying and score on an exam. b Years of education and salary. b 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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4 Bivariate Distributions and Scatterplots • Scatter Plot b Graph that shows the degree and direction of the relationship between two numerical variables. b Horizontal axis b Usually the variable that does the predicting. b Vertical axis b 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 PA • 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 • Draw the axes and decide which variable goes on
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This note was uploaded on 04/29/2010 for the course PSYCH 315 taught by Professor Afroditipanagopoulos during the Winter '10 term at Concordia Canada.

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

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