chapter3-study-guide

# chapter3-study-guide - AP Statistics Study Guide Chapter 3...

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AP Statistics Study Guide Chapter 3 Page 1 Mr. Martin October 8, 2010 Overview The study guide is in the order presented in the text. Sample questions are provided as a separate link on the web site. A key will be posted one day before the test. Explanatory and Response Variables Given a scenario and two variables be able to identify which variable is the explanatory and response variable. What is the effect if they are reversed. Know that the explanatory variable is plotted against the x-axis while the response variable is plotted on the y-axis. Correlation Correlation is not given in units. We do NOT say the r-value is -.03 pounds. Like a mean r-values are not resistant to change. Here are some other properties that you should remember: r > 0 = positive association; r < 0 = negative association. r always falls between –1 and 1. Values near 0 = weak linear relationship. As values near 1 or –1, the strength of the relationship increases and points lie close to a straight line.

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chapter3-study-guide - AP Statistics Study Guide Chapter 3...

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