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(Applying the Analysis) A value-added tax (VAT) :
Z Statistic
A type of standard score that indicates how many standard deviations an element is from the mean of the population.
Relative Risk
A measure in epidemiology that compares the risk of a health event among one group with the risk among another group.
Sample Proportion
A statistical measure that represents the proportion of success or a particular attribute in a sample.
Confidence Interval
A range of values, derived from sample statistics, that is likely to contain the value of an unknown population parameter, giving an estimate of the uncertainty around the main measurement.
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