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Corrected Statistics & Combined Groups

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  1. 1.

    For Q51, the corrected variance is:

  2. 2.

    The variance of 2, 4, 6, 8, 10, 12, 14 is:

  3. 3.

    Mean and SD of 100 observations are 40 and 5.1. Observation 50 was wrongly recorded as 40. Correct SD is:

  4. 4.

    Two groups have n1=20, mean1=30, var1=25 and n2=30, mean2=40, var2=36. Combined mean is:

  5. 5.

    Mean and variance of 20 observations are 10 and 4. If one observation 9 is wrongly recorded as 11, corrected mean is:

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