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Anonnumericlabeloranumericcodemaybeused slide 12

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Unformatted text preview: formation contained in the data. The scale indicates the data summarization and statistical analyses that are most appropriate. Slide 11 Scales of Measurement s Nominal • Data are labels or names used to identify an attribute of the element. • A nonnumeric label or a numeric code may be used. Slide 12 Scales of Measurement s Nominal • Example: Students of a university are classified by the school in which they are enrolled using a nonnumeric label such as Business, Humanities, Education, and so on. Alternatively, a numeric code could be used for the school variable (e.g. 1 denotes Business, 2 denotes Humanities, 3 denotes Education, and so on). Slide 13 What type of software do you use the most? 1 = Word Processor 2 = Spreadsheet 3 = Database 4 = An Email Program Slide 14 Scales of Measurement s Ordinal • The data have the properties of nominal data and the order or rank of the data is meaningful. • A nonnumeric label or a numeric code may be used. Slide 15 Scales of Measurement s Ordinal • Example: Students of a university are classified by their class standing using a nonnumeric label such as Freshman, Sophomore, Junior, or Senior. Alternatively, a numeric code could be used for the class standing variable (e.g. 1 denotes Freshman, 2 denotes Sophomore, and so on). Slide 16 The support staff of the Technical Support Group is: 1. Extremely Helpful 2. Very Helpful 3. Moderately Helpful 4. Not Very Helpful 5. Not Helpful At All Slide 17 Scales of Measurement s Interval • The data have the properties of ordinal data and the interval between observations is expressed in terms of a fixed unit of measure. • Interval data are always numeric. Slide 18 Scales of Measurement s Interval • Example: Melissa has an SAT score of 1205, while Kevin has an SAT score of 1090. Melissa scored 115 points more than Kevin. Slide 19 How useful is the support given by the Technical Support Group? NOT USEFUL EXTREMELY AT ALL USEFUL 1 2 3 4 5 Slide 20 Scales of Measurement s Ratio • The data have all the properties of interval data and the ratio of two values is meaningful. • Variables such as distance, height, weight, and time use the ratio scale. • This scale must contain a zero value that indicates that nothing exists for the variable at the zero point. Slide 21 Scales of Measurement s Ratio • Example: Melissa’s college record shows 36 credit hours earned, while Kevin’s record shows 72 credit hours earned. Kevin has twice as many credit hours earned as Melissa. Slide 22 Appro...
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