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Why is the standard deviation preferable to the range as a measure of variation? When you...

Why is the standard deviation preferable to the range as a measure of variation? When you use the standard deviation, as a measure of variation, what is the reference point? Discuss the difference between a sample and a population. What mathematical symbols are used are used for each of the following descriptive measure: 1) Sample mean 2) Sample standard deviation 3) Population mean 4) Population standard deviation.

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