Note: For the true-false questions, write T or F at theend of 1. The standard de

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Note: For the true-false questions, write T or F at theend of

1. The standard deviation is the positive squareroot of the variance and a measure of dispersion in the same unitsas the original data.

2. The interquartile range is the difference betweenthe values of the first and third quartile, indicating the range ofthe middle fifty percent of the observations.

3. According to the Empirical Rule, about 68 percentof the observations lie within plus and minus one standarddeviationof the mean.

4. For a symmetrical distribution, the variance isequal to the standard deviation.

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1. True 2. True 3. True 4. False

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