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S2 - Definition of "statistic" watch

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    The book says:

    "Statistic - a random variable consisting of any function of the samle data that involves no other quantities"

    Could someone clarify this, I am not sure exactly what it means...
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    A random variable (basically means it is not constant, changes with the sample data)
    A function of the sample data, such as calculating the median
    Involving no other quantities...basically does not include unknown quantities that can not be calculated via the sample data, e.g. calculating the standasrd deviation of the population (involves mu)
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    ok, thank you
 
 
 
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