Question

a. which measure of variation is preferred when the mean is used as a measure of center? b. which measure of variation is preferred when the median is used as a measure of center? a. the standard deviation is preferred when the mean is used as a measure of center. b. the variance, interquartile range, mode, frequency is preferred when the median is used as a measure of center.

Explanation:

The standard - deviation is related to the mean, while the inter - quartile range is not affected by extreme values and is paired with the median as a measure of center. Variance is also related to the mean. Mode is the most frequent value and frequency is the count of values, neither is a measure of variation paired with the median.

Answer:

b. interquartile range