62.5% is the ideal quiz score. Here’s why


 What is the optimum average score for a quiz? 100%? Not in my view. It is 62.5%, or a number close to that.

When using a quiz as a summative assessment, your goal is maximum discrimination. That is, you want to be able to see as clearly as possible which students have ‘got it’ and which have not.

Consider a Continue reading

Misleading question statistics

I threw this question into the 2014 Christmas quiz with no real expectation that anyone would get it. The (possibility of a) Technological Singularity is something every kid needs to grow up being aware of, so this was my contribution to building awareness.

Fake certainty

But look! 40% got it! That is double the guess rate, so we can conclude that one student in 5 actually knew the answer.

Or can we? Continue reading

Pair Match analysis tutorial

Pair match questions can be used to test for understanding of sequence and relationship in quite subtle ways, but they serve you poorly if you do not know how to analyse the results.

Below is an analysis of a pair match (AKA Drag and Drop) question from the Computing Baseline (High level). This is the author’s view, using data from about 1,500 responses. The teacher’s view shows only the data from Continue reading