Psychometric Theory Case Study 3.docx - Daniel Washington...

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Daniel Washington Psychometric Theory 10/28/19 Case Study 3 Assume that you are developing a fear-of-snakes measure, with a 6-choice Likert response format, using 300 subjects. Although more items would be desirable for actual scale development, for these exercises: 1. Generate a pool of 10 Likert-format items 2. Estimate, for each item you have written, what Likert scale values would be endorsed by the "average person" (i.e., neither a phobic nor a snake lover) 3. Pick an item from the pool that you suspect might elicit an extreme response from an average person and rewrite it to elicit a more moderate response 4. Generate another 10 Likert items to tap a construct other than fear of snakes. Randomly mix these items with the original 10 and ask a few of your friends to indicate what they think each of the items is intended to measure 5 Using either fear of snakes or the construct underlying your second pool of 10 items list directly observable behaviors that could be used to validate a scale measuring that construct and explain how you could use behavioral data for validation. For each of the questions below, circle the response that best characterizes how you feel about the statement, where 1 = Strongly Agree, 2 = Agree, 3 = Slightly Agree, 4 = Slightly Disagree, 5 = Disagree, 6 = Strongly Disagree Fear
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