Cronbach's alpha

Cronbach's Alpha is a way of measuring how reliable a test is. It helps us make sure that the questions on the test are all measuring the same thing. To do this, it looks at how much the different questions on the test all "agree" with each other. When the questions all agree, then the test is reliable and Cronbach's Alpha will be high, meaning the test is good. When the questions don't agree, the test isn't reliable, so Cronbach's Alpha will be low, meaning the test isn't good.