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What types of Standard Dev./Stats Questions are on the exam?

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What types of Standard Dev./Stats Questions are on the exam? [#permalink] New post 19 Mar 2004, 10:05
I hear so much about top quant scorers encountering Standard Deviation and/or stats questions once or twice in their first ten questions.

My question is - what types of questions are you seeing?

Are they asking you to compute the Standard Deviation?

Are they asking for a distribution?

Do they give you info about mean/median and you have to deduce standard deviation info from here?

Just looking for some clarification on what to study. It's easy to study the formula for computing SD, but I'm sure we need more than that to do well. Thanks.
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 [#permalink] New post 19 Mar 2004, 12:05
Hey JJ,

I am not exactly certain, but I believe from what I encountered, and what I saw on the first exam I took. Yes, I did take it once already, its been a few months since. Without getting myself in trouble (copyright), I think the questions mightbe something like this:

A number is added to a set, which of the following must be true if the SD of the set increased.
Or they might list numbers in 5 different sets, and ask for the one with greatest SD, lowest, and so on.

Think about it, bottom line is, I dont think they'll ask to calculate SD or anything of that nature, but they might ask questions that test the knowledge of relationship between the numbers, sets, what happens to SD when Range increases/decreases and so on.

Hope that helps,

PS It really would be helpful if many of us here added their bit to this question. I definitely think its an important one. (One, right?, or is it, An important question?) Hmm, I think I've been studying for GMAT too much :roll:
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 [#permalink] New post 19 Mar 2004, 12:14
I think "one" is correct. It refers to the only preceding noun "question" from the previous sentence.
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SD Rules... [#permalink] New post 19 Mar 2004, 13:39
I'd imagine that these rules stand (correct me if I'm wrong):

1) Smaller sets of a distribution (10 elements) will have a larger standard deviation than a larger set of numbers (say...100 elements). Thus the larger the sample you average over, the smaller is your expected deviation from the exact result.

2) A set of X numbers with a smaller range will have a smaller standard deviation than a set of X numbers with a greater range.

Am I correct here?
SD Rules...   [#permalink] 19 Mar 2004, 13:39
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What types of Standard Dev./Stats Questions are on the exam?

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