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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Square each value in the data set
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Subtract each value in the data set from the mean
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Subtract the mean from each value in the data set
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Add the mean to each value in the data set
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Detailed explanation-1: -What is the symbol for sample variance? Once you’ve calculated the mean, and listed the values in a table, what is the next step to calculating the variance? After subtracting the mean from each value in the data set, the next step is to find the sum of those differences.
Detailed explanation-2: -The population variance is the variance of the population. To calculate the population variance, use the formula 2=1NN∑i=1(xi−)2 2 = 1 N ∑ i = 1 N ( x i − ) 2 where N is the size of the population consisting of x1, x2, …
Detailed explanation-3: -Step 1: Determine the mean of the data values. Step 2: Subtract the mean of the data from each value in the data set to determine the difference between the data value and the mean: . Step 3: Square each of these differences and determine the total of these positive, squared results. More items •26-Jul-2022