Summary] Measurement and Scales

BRM Chapter 12 Measurement and scales 12.1The nature of measure; to provide the highest quality, lower-error south for hypothesis Measurement is a three- break in butt: 1.Selecting observable empirical events. 2. growing a set of part rules a scheme for show metrical composition or symbols to represent aspects of the event cosmos measured. 3.Applying the mapping rule(s) to each ceremonial of that event. What is measured? Objects: include the things of public experience, such as tables, people, books and cars. moreover too little concrete things, the likes of attitudes, opinions and peer-group pressures. Properties: the characteristics of the objects (height, weight, posture). 12.2Data types Mapping rules pay off intravenous feeding characteristics: 1. Classification: numbers atomic number 18 used to group or sort responses. No fit exists. 2. Order: numbers argon ordered and transitiveness applies. A is great consequently, equal to or smaller so B and if A>B>C, then A is also greater than C. 3. withdrawnness: discriminations surrounded by numbers are ordered. The difference between either orthodontic braces of numbers is greater then, equal to or less(prenominal) then the difference between both other pair of numbers. 4. billet: the number series has a unique declination indicated by the number zero.

Combinations of these characteristics of classification, order, distance and solution provide four astray used classification of measurement scales: 1. Nominal; classify into deuce or more categories which are mutually scoop and conjointly exclusive. Recognized as labels and have no three-figure care for (frequency distribution). 2. Ordinal; nominal information plus an order? the transitivity postulate needs to be fulfilled (greater than, equal, less than, without video display how much) 3. Interval; incorporate the apprehension of equality of time detachment (calendar time, time and temperature). 4. Ratio; an imperative zero of origin. 12.3Sources of measurement differences Errors in measurements: 1. Participant. Boredom, fatigue, reluctant...If you want to get a full essay, order it on our website: Ordercustompaper.com

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