Answer to Question #1105 in Statistics and Probability for abby
t-test for Related Samples : when we have to compare to paired groups, to check their means or sta;
Correlational Analysis : when we have to check if there some relationships between two or more observed veriables are exist.
the z-test: if we have to check the null hypothesis in the sample with a huge number of observations ( or we know the standard deviation of the population.
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