It’s easy to get confused by the concepts of test or measurement validity and reliability. They’re both really important concepts in research, so let’s look at them in closer detail. I’m going to use a silly, but hopefully memorable, example. Let’s say you’re doing a study about how two groups (let’s say happy clowns and sad clowns) compare in their ability to parallel park. You select a sample of each kind of clown; you match them for age and driving experience. Now, you watch while each clown parks a little clown fire engine against a curb, in between two little clown PT cruisers. You measure each clown’s parking ability by how far away from the curb they get the front and back ends of the little clown fire truck.
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