Examlex
The asteroid or comet that impacted Earth and either caused or hastened the extinction of 70 percent of all living species on Earth happened approximately 650 thousand years ago.
Test Statistic
A calculated value from sample data used in hypothesis testing to determine whether to reject the null hypothesis.
Calculated Value
A numeric value derived from mathematical operations on data or parameters.
Population Variances
A measure of the dispersion of all the values in a population, reflecting how much the individuals within the population differ from the population mean.
Equal Variances
An assumption in certain statistical tests that the variance within each of the groups or samples is the same across all groups or samples.
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