Psychological
  Measurement
  mark.hurlstone
  @uwa.edu.au
  Distributions              Individual Differences and Correlation
  Variability and
  Distributions
  Central Tendency
  Variability
  Distribution Shapes         PSYC3302: Psychological Measurement and Its
  Covariability                                            Applications
  Covariance
  Correlation
  Composite                                                 MarkHurlstone
  Variables                                        Univeristy of Western Australia
  Interpreting
  Test Scores
  ZScores                                                      Week2
  TScores
  Percentile Ranks
  Normalised Scores
  Test Norms
  References
                                 mark.hurlstone@uwa.edu.au      Psychological Measurement
                  Learning Objectives
  Psychological
  Measurement
  mark.hurlstone
  @uwa.edu.au
  Distributions
  Variability and
  Distributions         • Foundations of psychological measurement:
  Central Tendency
  Variability                  • variability
  Distribution Shapes
  Covariability                • covariability
  Covariance                   • interpreting test scores
  Correlation
  Composite
  Variables
  Interpreting
  Test Scores
  ZScores
  TScores
  Percentile Ranks
  Normalised Scores
  Test Norms
  References
                                 mark.hurlstone@uwa.edu.au      Psychological Measurement
                              Individual Differences
   Psychological
   Measurement
  mark.hurlstone                       • Individual differences are the currency of psychometric
   @uwa.edu.au                               analysis
  Distributions                        • It is assumed that individual differences in psychological
  Variability and                            attributes exist between people, and that these differences
  Distributions
   Central Tendency                          can be quantified
   Variability
   Distribution Shapes                 • To measure individual differences on some psychological
  Covariability                              attribute, we administer a psychological test or measure that
   Covariance
   Correlation                               is assumed to tap that attribute to a group of people
  Composite
  Variables                            • The resulting collection of measurement or test scores
  Interpreting                               constitutes a distribution of scores
  Test Scores
   ZScores                             •
   TScores                                   Variability is the term used to describe the differences
   Percentile Ranks                          amongthescoresinadistribution
   Normalised Scores
  Test Norms
  References
                                                      mark.hurlstone@uwa.edu.au                          Psychological Measurement
                  Individual Differences
  Psychological
  Measurement
  mark.hurlstone
  @uwa.edu.au
  Distributions
  Variability and
  Distributions
  Central Tendency      •
  Variability               Before we look at the concept of variability, let’s first talk a bit
  Distribution Shapes       moreaboutdistributions of scores
  Covariability
  Covariance
  Correlation
  Composite
  Variables
  Interpreting
  Test Scores
  ZScores
  TScores
  Percentile Ranks
  Normalised Scores
  Test Norms
  References
                                 mark.hurlstone@uwa.edu.au      Psychological Measurement