Day 66: Test Corrections

Thursday, 13 November 2014


The question. I asked student to solve for magnification.


Here’s the correction for the above problem. She solved for the focal length incorrectly at the start of the problem but all other work was correct.


This kid mostly got the correction right — they did indeed forget a negative sign. I felt it was bit too nitpicky of me to say that the “decimal in the wrong spot” is really a unit conversion problem.

Examples of good test corrections. I recommend building in about 20% of the test time to dedicate to corrections. That is, I build tests that should take 50 minutes plus 10 minutes of corrections.


One thought on “Day 66: Test Corrections

  1. Pingback: Day 149: Rethinking Test Formats | Physics180: A photo-a-day blog

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