Validity And Reliabilty
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Validity And Reliabilty

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Validity And Reliabilty Validity And Reliabilty Presentation Transcript

  • This presentation was developed for the exclusive use of students enrolled in: Educational Testing & Grading, Professor Gregory E. Stone. © 2004 Gregory E. Stone. All rights reserved. This presentation may not be reproduced in any form, in part or as a whole, without the express written permission of the author.
  • Exam Score Quality Validity & Reliability
  • No matter how well the objectives are written, or how clever the items, the quality and usefulness of an examination is predicated on Validity and Reliability Validity & Reliability
  • Evaluative Examination Score Quality Statistical Validity & Reliability
  • Validity Examination Score Quality Reliability Validity & Reliability
  • Validity BOTH CONCEPTS RELATE TO THE SCORE NOT THE TEST! Reliability Validity & Reliability
  • Validity Reliability We don’t say “an exam is valid and reliable” We do say “the exam score is reliable and Valid for a specified purpose” KEY ELEMENT! Validity & Reliability
  • Reliability “Was the measure of student ability reached by accident or chance, or was it reached through a clear and stable, meaningful examination?” Validity & Reliability
  • Reliability Answers questions relative to the stability and clarity of an examination. Validity & Reliability
  • Reliability Reliability is a STATISTIC. Specifically, a correlation ranging from 0 = Completely Unreliable 1 = Perfectly Reliable Validity & Reliability
  • Reliability Reliability is also a measure of error within an examination. Poor wording, ambiguity, correct answer issues, failure to link with objectives, etc. Validity & Reliability
  • Content/ Action + Error Validity & Reliability
  • The information we seek and our best hope for obtaining it. Content/ Action + Error Validity & Reliability
  • The information we seek and our best hope for obtaining it. Content/ Action + Error Our human frailty and inability to write effective questions. Validity & Reliability
  • Reliability Reliability comes in multiple forms, including: Test-Retest Reliability Split-Half Reliability Validity & Reliability
  • Reliability Test-Restest Administer to students. After time, administer again. Are the students performing in a consistent manner? Validity & Reliability
  • Reliability Split-Half Create 2 smaller content Balanced tests and administer. Do students perform similarly on each test half? Validity & Reliability
  • Validity “Did the test we created really measure what we hoped it would measure?” Validity & Reliability
  • Validity Relates to questions about the reasonability of content, criterion and construct associated with the learning objectives and assessment. Validity & Reliability
  • Validity & Reliability
  • Validity & Reliability
  • Validity Content Related Validity Does the content we have selected appropriately represent our construct (top level domain)? Validity & Reliability
  • Validity Construct Validity Is there really such a concept as what we created as a construct? (e.g. Does “reading ability” really exist?) Validity & Reliability
  • Validity Criterion Related Validity Does our test adequately link the content to the construct? Is the test a good measure of the construct? Validity & Reliability
  • Validity Examination Quality Reliability Validity & Reliability
  • Validity & Reliability
  • RELIABILITY is a necessary but not sufficient condition for VALIDITY Validity & Reliability