Examlex
Which of the statements below is not true about stratified sampling?
Population standard deviation
The square root of the variance of a population, which measures the dispersion of a set of values relative to their mean.
Margin of error
An expression of the amount of random sampling error in a survey's results. It represents the range within which the true value lies, based on a certain confidence level.
Sample mean
The average of a set of data points or observations taken from a larger population.
Checkout times
The duration or period it takes for a customer to complete a purchase transaction from start to finish.
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