Explanation of mean variance and standard deviation
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The standard deviation is the square root of the variance: The variance and the standard deviation are both measures of the spread of the distribution about the mean. For example, if our variable represents the weight of a person in pounds, the variance measures spread about the mean in squared pounds.
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The variance (symbolized by S2) and standard deviation (the square root of the variance, symbolized by S) are the most commonly used measures of spread. We know that variance is a measure of how spread out a data set is. It is calculated as the average squared deviation of each number from the mean of a data set...
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The variance (symbolized by S2) and standard deviation (the square root of the variance, symbolized by S) are the most commonly used measures of spread. We know that variance is a measure of how spread out a data set is. It is calculated as the average squared deviation of each number from the mean of a data set...
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