by StaceyKoprince Tue Jan 18, 2011 2:32 pm
That's because your individual strengths and weaknesses do not match the collective strengths and weaknesses of the entire testing population.
The difficulty levels are based on how our students actually do on the questions. When we post a new question for the first time, we make our best guess. As soon as the question has been given to enough students (minimum of 200 across different scoring buckets - up to 1,000 total) that we've collected good data, we have a program that analyzes the data and tells us what difficulty level the question actually is. And then we adjust the level in the test.
You will always feel that certain questions are easier or harder than the official rating - because you're basing your assessment on your own strengths and weaknesses, that's all. :)
Stacey Koprince
Instructor
Director, Content & Curriculum
ManhattanPrep