Examlex
How have presidents used the mass media to their advantage? What role has changing technology played?
Degrees of Freedom
Defines the number of independent values or quantities that can vary in an analysis without breaking any constraints.
Two-Sample T Test
A statistical analysis used to compare the means of two independent samples to determine if there is a statistically significant difference between them.
Pooled Estimate
A method to estimate a combined variance from two or more groups that assumes the groups have the same variance.
F Test
A statistical test used to determine if there are significant differences between the variances of two or more samples.
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