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A quality control chart is used to monitor the customer wait time at a local call center. Sample means of five times are averaged and plotted over time. The last five sample means show a trend of decreasing sample means. The process is ________.
Variability
A statistical measure that expresses the degree of dispersion or spread in a data set, indicative of how much individuals within the set differ.
Symmetry
A property of shapes or designs where one half is a mirror image of the other half.
Bimodal
Describing a distribution that has two different modes or peaks in its frequency of occurrence.
Frequency
The number of times an event occurs within a given data set.
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