Study your flashcards anywhere!

Download the official Cram app for free >

  • Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off

How to study your flashcards.

Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key

Up/Down arrow keys: Flip the card between the front and back.down keyup key

H key: Show hint (3rd side).h key

A key: Read text to speech.a key


Play button


Play button




Click to flip

15 Cards in this Set

  • Front
  • Back
An item difficulty index of .80 indicates that ____% of examninees answered item CORRECTLY
what item difficulty index represents the MOST differentiation the item makes between examinees?
what is the optimal item difficulty level?

note: except for true/false questions... then it's .75
classical test theory
obtained test score reflects combination of truth & error
what theory is item difficulty, reliability, & validity based on?
classical test theory
item response theory
item characteristics stay the same accross samples ie sample-invariant
methods used to evaluate reliability
alternate forms
split-half (e.g. Spearman-Brown)
coefficient alpha (e.g. Kuder-Richardson Formula 20)
what does a reliability coefficient of .80 mean?
80% of variability in test scores is due to differences in true scores.

20% due to measurement error
which method of reliability is NOT appropriate for speed tests
internal consistency
i.e. split-half
which method of reliability is considered to be the most thorough?
alternate forms
what is the lowest reliability coefficient to be considered acceptable?
what is a standard error of measurement for?
to calculate a confidence level around an examinee's score
confidence intervals
68% +/- 1 standard error
95% +/- 2 standard errors
99% +/- 3 standard errors
when would you use criterion-related validity
to predict scores on some other measure
2 methods used to test construct validity
2. convergent & divergent validity othersise known as, Multitrait-Multimethod Matrix

2. factor analysis