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lion
lion asked in Science & MathematicsMathematics · 1 decade ago

Help please with a Math Question?

The standard deviation of a population is 70 and we want the standard error (the standard deviation of the sample mean) to be 14, then we need to take: (Hint: Start with the equation for standard error, and solve for “n”.).

I am thinking 25 samples, right?

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  • Guillermo
    Lv 7
    1 decade ago
    Favorite Answer

    Right!

    σxmean = σx/sqrt(n)

    sqrt(n)*14 = 70

    sqrt(n) = 5

    n = 25

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