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    Population estimation




    Hi,

    Just would like to ask for some of your valuable advice!

    I am working on the project which would like to use the small sample to estimate the mean of the population.

    The question is, in my situation, my sample size is quite large saying over 1000, should I change the formula for population instead of for sample in my case?

    My problem is, when I divided the population standard deviation by the square root of sample size, the t value becomes very small and it make the p value comes to be zero but I know it is wrong.

    Thanks for your sharing first

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    Re: Population estimation

    hi,
    so, you know the right value of the population mean? Why do the test then?
    Maybe you undeerstimate the population sd?

    regards

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    Re: Population estimation

    The reason I know it is wrong is I used the 30 days data in the whole 1 year data. I treated the 1 year data as the population, set 30 days data as the sample. The big difference between makes me doubt on the result

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    Re: Population estimation


    hi,
    you might have seasonal variations, so the 30 days data might not be representative. What would you get if you took a really random sample from the year's worth of data?

    regards

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