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“In the “getting started” lesson, I asked that you visit the professional testin
“In the “getting started” lesson, I asked that you visit the professional testing website. I was particularly interested by Step 9 of website because it introduced the idea of item difficulty. While teachers typically grade a test on the basis of a passsing grade of 60% correct, step 9 points out that 60% correct, or an item difficulty of .60, actually is optimal for increasing the discriminatory value of the test. That’s discrimination in a good sense, separating those who know the course material from those who don’t. However, composing a test where students, on avearge, only get 60% correct is antithetical to what most teachers think is a good test. Reactions?——————–”
Step 9 document is attached.
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