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Math Help - Finding sample size

  1. #1
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    Finding sample size

    i need to find the size of 2 samples based on this information

    The population variance of the distribution for X is 100. 2 random samples of size n1 and n2 are repeatedly taken from the population. the sample means for sample size n1 and sample size n2 have the follwing distributions:

    X ~ N(1,10)
    X ~ N(1,2.5)
    (X should be X with a bar over it)

    any help please??
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  2. #2
    Grand Panjandrum
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    Re: Finding sample size

    Quote Originally Posted by blueberryhill View Post
    i need to find the size of 2 samples based on this information

    The population variance of the distribution for X is 100. 2 random samples of size n1 and n2 are repeatedly taken from the population. the sample means for sample size n1 and sample size n2 have the follwing distributions:

    X ~ N(1,10)
    X ~ N(1,2.5)
    (X should be X with a bar over it)

    any help please??
    The sample mean for a sample of size n is approximately \sim N(\mu,\sigma^2/n) where \mu is the population mean and \sigma^2 the population variance.

    CB
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