Variance in a behavior that is related to variables that an investigator is investigating is systematic variance.
What is variance?
A measurement of variability for the standard deviation of scores from the mean.
What is systematic variation?
The term "systematic variation" typically refers to an anomaly or error in observations that are caused by variables that are outside the scope of statistical control.
Which measure of central tendency is used most often?
When your data distribution is continuous and symmetrical, such as when your data are normally distributed, the mean is typically the best measure of central tendency to utilize.
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The answer is ‘fashions changed, and the use of furs in fashion ended’
