Examlex
Following the reptilian extinctions at the close of the Mesozoic era, two groups of mammals, the marsupials and ______ , evolved and expanded.
Alternative Hypothesis
A statement proposing a relationship between variables, differing from the null hypothesis, and is tested for possible acceptance.
µ
The symbol for the mean (average) of a population in statistics.
Null Hypothesis
A statement in statistical testing that assumes there is no significant difference between specified populations, any observed difference being due to sampling or experimental error.
Means
Statistical measure referring to the average or central value of a set of numbers.
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