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    Hypothesis test help E.Devitt

    I've seen on exam questions that sometimes the standard deviation is put over the square root of the population sample to find the margin of error in the 95% confidence interval. Havent seen that before and I'm wondering why its there???

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      h.ollie_

      It's new to the course since 2014

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      h.ollie_

      It's not the standard deviation , it's just 1 over the square root of the population sample

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      Me

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