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# October 2.docx

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School
University of Lethbridge
Department
Statistics
Course
STAT 1770
Professor
John Sheriff
Semester
Fall

Description
October 2, 2013 Chapter 4, Sec 4, pgs 89­92 Chapter 3, Sec 1­3, pgs 149­161 Chapter 6­ Association between Quantitative Variables • What variables might be related/associated with what kind of gas mileage a  vehicle gets? o Environmental factors­ Wind speed­ Quantitative, Categorical (bare road) o Gas used­ Categorical o Engine size/ 4wd vs 2wd­ Quantitative o Condition of vehicle­ Categorical, Quantitative o Towing ­ Quantitative o City vs. highway­ Quantitative, Categorical o Speed of vehicle Response and Explanatory Variables • Response variable (dependent variable): o  the outcome variable on which comparisons are made it is usually the  variable of interest • Explanatory variable (Predictor variable/Independent variable) o Defines the groups to be compared with respect to values on the response  variable • Variables may be quantitative or categorical o Not necessarily a casual relationship • Example: Response / Explanatory o Blood alcohol level/# of bottle of beer consumed o Grade on test / amount of study time o Binge drinking / gender o Number of cigarettes per week/ number of alcoholic drinks per week Exercise 6.4­ Hard drives: Capacity vs. Pric
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