QR on DAT Achiever...

[Tracy47]

is it representative? It has a lot of calculations, and probability problems it seems.

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[Tracy47]

Also, is there 2 different formulas for standard variance, one is for population, and one is for sample? with population, you divide it by N, and with sample, you divide it by N-1?

 

[howui3]

The QR on the DATachiever is a little bit harder than the real exam. On the real DAT I did not have crazy probability questions, just simple probability of flipping heads or tails.

The trig on the real exam, at least my DAT, was easier.

But a lot of the questions from the DAT achierver compare pretty well to the real test. You could use it as an indicator, if you are scoring 15's then you need more practice, but if you are getting 19's then you are ok.

For me, I was getting 19-20 on the DATachiever, and got a 22 on the real one.

Here is a decent website that explains standard deviation and variance. Good luck.

http://mathworld.wolfram.com/StandardDeviation.html