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Null Hypothesis
A theory proposing that there's no meaningful statistical distinction between the two variables under consideration in the hypothesis.
Rejection Region
The area in a statistical test's distribution which, if the test statistic falls within, leads to the rejection of the null hypothesis.
Standard Deviation
An index showing the degree of spread or deviation from the mean within a data collection.
Confidence Level
The probability, expressed as a percentage, that the calculated confidence interval actually includes the true population parameter.
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