Examlex
The average user on Facebook has 1,030 friends.
Degrees of Freedom
The number of independent values or quantities that can vary in the calculation of a statistic, often associated with the number of observations minus the number of parameters estimated.
Population Variance
The average of the squared differences from the mean for every individual in an entire population, quantifying the overall variation within that population.
Hypotheses Test
A statistical method that uses sample data to evaluate a hypothesis about a population parameter.
Significance Level
The probability of rejecting the null hypothesis when it is true, used as a threshold in hypothesis testing.
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