Concept explainers
Statistical Literacy
(a) What measures of variation indicate spread about the mean?
(b) Which graphic display shows the median and the data spread about the median?
The measures of variation indicate spread about the mean.
Answer to Problem 1CR
Solution: Variance and standard deviation are the measures of variation indicate spread about the mean.
Explanation of Solution
Dispersion indicates the extent to which observations deviate from an appropriate measure of central tendency. Measures of dispersion fall into two categories, that is, an absolute measure of dispersion and relative measure of dispersion. Variance and standard deviation are two types of an absolute measure of variability, which describes how the observations are spread out around the mean. The standard deviation is the square root of the variance.
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