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

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 8 Measuring
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Outline Measurement Basics Know You Variables Measurements Valid and Invalid Predictive Validity Measurements Accurate and Inaccurate Improving Reliability, Reducing Bias
Background image of page 2
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
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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?
Background image of page 4
Measurement Basics
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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.
Background image of page 6
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
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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?
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

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.

Page1 / 29

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

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online