STATISTICAL TECHNIQUES AND TOOLS
MEASURES OF VARIABILITY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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After subtracting the mean from each value in the data set, the next step is to find the sum of those differences.
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True, then square that sum.
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False. Square the differences, then find the sum.
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Either A or B
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None of the above
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Explanation:
Detailed explanation-1: -A more straightforward calculation recognizes that the variance is equal to the mean of squares, minus the square of means (mnemonic: MOSSOM), that is. 2 = ( xi2 ) / n-2.
Detailed explanation-2: -Adding a constant to each value: The median, mean, and quartiles will be changed by adding a constant to each value. However, the range, interquartile range, standard deviation and variance will remain the same.
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