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Profit Margin
A financial metric expressing the ratio of net income to sales, showing the percentage of revenue that remains as profit after all expenses are paid.
Population Average
The mean value of a particular characteristic for the entire population being studied.
Standard Error
Describes a statistical measure that estimates the accuracy with which a sample represents a population.
Critical Value
A point on the scale of the test statistic beyond which we reject the null hypothesis; it's determined by the significance level.
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