Discussion – Week 5
Ensuring Test Reliability
According to classical test theory, test reliability is based on the notion that test score reliability comprises two parts: true scores and error. A true score is an expected score on a test over an infinite number of testing instances; it is a theoretical idea that can never be known for sure. Errors are inaccuracies that make actual (observed) test scores differ from true scores.
There are several different ways to measure a test’s reliability. Test–retest reliability looks at the correlation between original test administrations and retests. The span of time between the two administrations should be less that the time for the true scores to vary. Test–retest reliability looks at error due to time.
Alternate-form reliability looks at the correlation between two different versions of a test. Split-half reliability is similar to alternative-form reliability, splitting a single test into two halves, usually odd and even items, and correlating scores on the two halves. Cronbach’s coefficient alpha is also similar, essentially providing the average of all possible split-half reliabilities. Alternate-form, split-half, and Cronbach’s coefficient alpha all look at error due to content sampling.
For this Discussion, pretend that you have been contracted to create a test to assess intelligence. Think about factors you might consider and steps you might take to ensure reliability of this test.
With these thoughts in mind:
Post a description of factors you might consider and steps you might take to ensure reliability of the intelligence test. Explain why these factors and steps are important (2 pages)
Be sure to support your postings and responses with specific references to the Learning Resources.
Read a selection of your colleagues’ postings.
Respond to at least two of your colleagues’ (one page per student=2 pages) postings in one or more of the following ways:
Ask a probing question.
Share an insight from having read your colleague’s posting.
Offer and support an opinion.
Validate an idea with your own experience.
Make a suggestion.
Expand on your colleague’s posting.
Return to this Discussion in a few days to read the responses to your initial posting. Note what you have learned and/or any insights you have gained as a result of the comments your colleagues made.
Assignment: Developing Test Items (2 pages)
In Week 3, you submitted your test specifications. Now, you should incorporate your Instructor’s feedback and create your test items. Remember to write your items so that they are clear and unambiguous. Avoid compound items (e.g., “I am happy most days and I usually like to smile”). Also make sure that the items are representative of the construct that you are measuring.
Submit test items for your assessment, based on your test specifications.
Support your Application Assignment with specific references to all resources used in its preparation. You are to provide a reference list for all resources, including those in the Learning Resources for this course.
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