Lesson 1- COMM 215 Fall13-TeacherPost

# nominal scale a variable

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Unformatted text preview: il   Ratio scale Absolute Zero   All the properties of interval data   The ratio of two values is meaningful. ▪  E.g: distance, height, weight .   Bob is 140lbs, Mary is 70lbs.   Bob is _________ heavier than Mary. Eric has a GPA is 3.00, Sam has a GPA of 1.50. Can you say Eric is two ­times smarter than Sam? For each of the following, indicate the scale of measurement that best describes the information.   In 2008, Dell corporation had approximately 78,000 employees. ANSWER: Ratio scale; there is an absolute zero point associated with the number of employees. Source: Fortune, May 4, 2009, p.F ­48 For each of the following, indicate the scale of measurement that best describes the information.   USA Today reports that the previous day’s highest temperature in the United States was 105 degrees in Death Valley, California. ANSWER: Interval scale; there is no absolute zero point for temperature.   Source: USA Today, June 19, 2009, p.12A For each of the following, indicate the scale of measurement that best describes the information.   An individual respondent answers “yes” when asked if TV contributes to violence in Canada. ANSWER: Nominal scale; we could use "1" to identify yes and "0" for no. For each of the following, indicate the scale of measurement that best describes the information.   In a comparison test of family sedans, a magazine rates the Toyota Camry higher than the VW Passat. ANSWER: Ordinal scale; the cars are ranked but there is no measure for the distance between them. Population: All students who have taken COMM 215 A population is a set of units ( usually people, objects, transactions, or events) that we are interested in studying. E.g. All students who have taken COMM 215. http://www.cartoonstock.com/newscartoons/cartoonists/hkh/lowres/hkhn17l.jpg A census: An examination of all units in a population. Sample: Samie’s COMM 215 Sections Experimental Unit : Samie is going to collect data from her sections. Voluntary response sampling Simple Random sampling Stratiﬁed random sampling POPULATION EYE COLOR BLUE EYES BROWN EYES BLACK EYES Systematic sampling GREEN EYES   Categorical Data vs Quantitative Data   Cross ­Sectional vs Time Series   Categorical Data   Grouped by speciﬁc categories.   Categorical data are obtained using either Nominal Ordinal the __________ or ___________ scale of measurement.   Quantitative Data   Numeric values   Quantitative data are obtained using either Ratio Interval the __________ or...
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