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TranceNova

  • 3 years ago

Standard Error: Okay, so I keep getting confused. If I have 2 samples from one treatment and 2 from another then I calc the difference between the means for these two samples, how do I find the standard error of the difference of the two means?

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  1. TranceNova
    • 3 years ago
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    Does my question make sense?

  2. LagrangeSon678
    • 3 years ago
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    basically your looking for standard deviation?

  3. TranceNova
    • 3 years ago
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    Well the standard error is the standard dev/ sqrt(n), but I presume any rules applying to stdev also apply for standard error.

  4. LagrangeSon678
    • 3 years ago
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    basically are you looking for a formula

  5. TranceNova
    • 3 years ago
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    Hmmm if there is one? The problem is I can get the standard error of both means but when I minus one mean from the other I don't know the standard error of the resulting number

  6. LagrangeSon678
    • 3 years ago
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    there is a formula for this situation and i believe it can be applied here

  7. LagrangeSon678
    • 3 years ago
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    its a formula for a finding the standard deviation of the sampling mean differences

  8. TranceNova
    • 3 years ago
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    Thanks, I'm looking it up now

  9. TranceNova
    • 3 years ago
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    Just posting this so when I come looking for it again it'll be saved on here :P SE = sqrt[(s12/n1) + (s22/n2)] where s1 is the standard deviation of sample 1, s2 is the standard deviation of sample 2, n1 is the size of sample 1, and n2 is the size of sample 2. Cheers LagrangeSon, now my chart has error bars hehe P.s. You know there are 52 other facts you haven't read :P

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