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  1. #1
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    ive posted a clearer message ahead
    Last edited by puestadeluna; 09-26-2005 at 02:40 PM.

  2. #2
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    Hi puestadeluna,

    Welcome to Talk Stats.

    In #1 if n is sample size, when you take different samples, n may be different.

    For #2, you could get one sample with sd very close to ppopulation sd just by chance. In general, sample sd will approximate the population sd as sample size increases.

    I don't quite understand #3, if you have more than one population then you need to specify where the samples come from.

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