Examlex
Homo (our genus) first appears in the fossil record about how long ago?
Null Hypothesis
An assumption made for statistical testing that indicates no effect or no difference, used as a basis for comparison.
Test Statistic
A value calculated from sample data during hypothesis testing. It is used to decide whether to reject the null hypothesis.
Population Mean
The average value of a set of characteristics for an entire population.
Alpha
A threshold value in hypothesis testing that determines the level of significance, usually set to 0.05 or 0.01.
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