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Unformatted text preview: STAT 1124 Statistical Methods I Correlation I Ch 4 Albert Wong, Ph.D. Langara College January 2009 Bivariate Analysis Analysis of two variables simultaneously (bivariate analysis) Descriptive Statistics: Scatterplot Coefficient of Correlation (correlation coefficient) Inferential statistics: Statistical Significance of correlation coefficient Regression Analysis Bivariate Descriptive Statistics Graphical representation scatterplot Summary Statistics Correlation coefficient Measures statistically the strength of a linear relationship between two variables (could be an explanatory variable and a response variable) Response and Explanatory Variables Response (dependent) variable measures an outcome of a study Explanatory (independent) variable may explain or influence changes in response variable Some studies just look at possible linear relationship between two variables Examples: Weight versus Height Number of beers drank versus blood alcohol content SAT versus ACT Same idea will apply to analysis of a response variable and several explanatory variables Scatterplot To examine the linear relationship between two quantitative variables on the same subjects...
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