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The random error in the arithmetic mean ...

The random error in the arithmetic mean of 100 observations is x, then random error in the arithmetic mean of 400 observations would be

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`1/4 x `
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Knowledge Check

  • If random error in the arithmetic mean of 100 observations is x, then the randow error in the arithmetic mean of 500 observations would be

    A
    5x
    B
    `x//5`
    C
    25x
    D
    `x//25`

  • if the randon error in the arithmetic mean of 50 observations is alpha , then the random error in the arithmetic mean of 150 observations would be

    A
    `alpha`
    B
    `3alpha`
    C
    `(alpha)/(3)`
    D
    `2alpha`

  • Find the arithmetic mean of:

    A
    21
    B
    21.4
    C
    22.75
    D
    21.75

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