STATISTICAL TECHNIQUES AND TOOLS
MEASURES OF CENTER AND SPREAD
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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x̄
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n
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Detailed explanation-1: -The term “x bar” represents the sample mean. The symbol ‘ xi’ used in this formula represents the represents the sum of all scores present in the sample (say, in this case) x1 x2 x3 and so on.
Detailed explanation-2: -The sample mean is a statistic obtained by calculating the arithmetic average of the values of a variable in a sample. If the sample is drawn from probability distributions having a common expected value, then the sample mean is an estimator of that expected value. Definition.
Detailed explanation-3: -The general formula for calculating the sample mean is given by x̄ = ( xi ) / n. Here, x̄ represents the sample mean, xi refers all X sample values and n stands for the number of sample terms in the data set.