Chapter 8

# Chapter 8 - Chapter 8 Measuring Outline Measurement Basics Know You Variables Measurements Valid and Invalid Predictive Validity Measurements

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Chapter 8 Measuring

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Outline Measurement Basics Know You Variables Measurements Valid and Invalid Predictive Validity Measurements Accurate and Inaccurate Improving Reliability, Reducing Bias
Motivation Does this generation of Americans have more leisure time than the last generation of Americans? Overworked Americans says yes!! Time For Life says no!! Who’s correct? How do you define leisure time? driving to work cleaning your house

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Motivation How do we “measure” Happiness Pain relief Leisure time Why might letting each person rate their happiness, pain relief, etc. on a scale of 1 - 10 be a bad idea? Why might it be a good idea?
Measurement Basics

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Definition When we measure a property of a person or thing we assign a number to represent the property. That number is a measurement. An instrument is a device used to take a measurement.
Example Let a person rate their happiness on a scale of 1-10. What is the variable we’re trying to measure? How are we quantifying the variable? What is the instrument taking the measurement? Each instrument is different for each individual. How might this affect a study of happiness compared to using say a psychologist to rate each persons happiness? A. Increased Variability B. Increased Bias C. Decreased Variability D. Decreased Bias

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We wish to measure a students “readiness” for the SAT exam Possible questions We could ask them how ready they are on a scale of 1 – 10 We could have them take a pre-test What is the variable of interest? What are the types of measurements taken for the variable? What are the instruments used for obtaining the measurements?
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## This note was uploaded on 06/15/2011 for the course STAT 110 taught by Professor Johnson during the Fall '07 term at South Carolina.

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Chapter 8 - Chapter 8 Measuring Outline Measurement Basics Know You Variables Measurements Valid and Invalid Predictive Validity Measurements

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