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Clarifying the Effect of Test Speededness.

Maxwell R Hong1, Ying Cheng1

  • 1University of Notre Dame, IN, USA.

Applied Psychological Measurement
|September 26, 2019
PubMed
Summary

Test speededness, or rushing on tests, can impact reliability estimates differently based on how it occurs and item characteristics. Generally, speeded responses may decrease or not affect reliability, contrary to some previous findings.

Keywords:
Cronbach’s alphacareless responsesrandom responsesreliabilityspeeded responses

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Area of Science:

  • Psychometrics
  • Educational Measurement
  • Statistical Modeling

Background:

  • Test-taking speededness can influence reliability estimates, with prior research yielding conflicting conclusions on whether it attenuates or inflates these measures.
  • Previous studies suggest random guessing due to speededness should decrease reliability, but real-world data analyses have shown potential inflation.

Purpose of the Study:

  • To analytically derive and simulate the effects of test speededness on interitem correlations and reliability.
  • To investigate how different manifestations and prevalence of speeded behavior impact measurement reliability.
  • To clarify the relationship between test speededness, item characteristics, and reliability estimation.

Main Methods:

  • Analytical derivations were used to model the impact of speededness on correlations between dichotomous items.
  • Two simulation studies were conducted to assess the magnitude of speededness effects on interitem correlations and Cronbach's alpha.
  • Item-level characteristics and various speededness scenarios were incorporated into the simulations.

Main Results:

  • The impact of test speededness on interitem correlations is variable, depending on the specific manifestation of speededness and item properties.
  • Speeded responses generally attenuate or do not affect reliability estimates, with the outcome contingent on the prevalence of speededness and its interpretation.
  • The study identified specific conditions under which speededness influences reliability differently.

Conclusions:

  • Test speededness has a complex and variable effect on reliability, not always leading to attenuation as previously assumed.
  • Understanding the nuances of speededness manifestation is crucial for accurate interpretation of reliability estimates in high-stakes testing.
  • The findings provide a more refined framework for assessing the impact of time constraints on test scores and measurement precision.