It's just a control. Obviously, the results are not going to be as accurate--if you can ever call any statistics accurate--as, say the Weschler or SB or even the Raven. And scores fluctuate depending on a multiple of variables, anyway. Wescheler says I've got an IQ of 153, which is obviously a lot lower than the one from the Internet, and that's the number I'm going with (although I really like to say, "yeah, I totally have an IQ of 161.")
My scores on online tests vary depending on the time of day, how long I've been awake, what else I'm thinking about out at the time, if I care about the test, how many other tests I've taken, the types of questions being asked---and in some cases, the color and shapes of the graphics on certain questions. For instance, I am much better at seeing patterns in solid shapes than I am when presented with just outlines of shapes or thin lines. I make up for my weakness in maths (I am sure I've got dyscalcula 'cause I transpose numbers all the time) with very strong reasoning and verbal skills (and you can guess the answer to most of the questions 'cause they give you multiple choice answers to choose from, and from there, my dear Watson, it just involves logic.)
Anyway.
The first time I took that IQ test, I didn't realize it was timed. I got a 74. Totally freaked me out, so I read the instructions better and figured out what was wrong.
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Superman wears Jack Bauer pajamas.