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The units for the variance are the same as theunits for the original data (for example feet inches etc.).

The standard deviation is expressed in terms of the originalunits of measurement but the variance is not.

The mean of fifty sales receipts is $65.75 and the standarddeviation is $10.55. Using Chebysheffs Theorem 75% of the salesreceipts were between $44.65 and $86.85.

A population with 200 elements has a variance of 20. Fromthis information it can be shown that the population standarddeviation is 10.

In a positively skewed distribution the percentage ofdata between the smallest observationandQ1is less than the percentage ofdata betweenQ3and the largestobservation.

Which measures of central location and variability areconsidered to be resistant to extreme values?

Which of the following measures of variability is not sensitiveto extreme values?

The value of the standard deviation may be either positiveor negative while the value of the variance will always bepositive.

In a positively skewed distribution which of the following isthe correct statement?