When We Compare Test Scores

When we compare students based on test scores, we assume that when they took the test...

• They have had a good night's sleep
• They are not hungry
• They do not have any family or friendships issues distracting them
• They have all had access to the same information
• They have all had the same chance for practice
• They have all had the same teaching leading up to the test
• They all have the same type environment in which to take the test
• They all speak and understand English at the same level

What if just one of those assumptions is incorrect, or worse,  what if they all are?