comparing normal populations


A common task in statistics is to determine whether two normally distributed populations have the same mean. The appropriate test can depend on factors such as the sample size and whether the populations are paired or independent.


This concept has the prerequisites:


  • Know what the z-test and t-test are, and how to compute the p-values.
    • When would you use one rather than the other?
  • What are paired z-tests and t-tests? Why might they be preferable to ones assuming independent populations?
  • What is the difference between a one-sided and a two-sided test, and why would you use one over the other?
  • Be aware that the assumption that the populations are normally distributed is a strong one, and often not justified.

Core resources (we're sorry, we haven't finished tracking down resources for this concept yet)

Supplemental resources (the following are optional, but you may find them useful)


See also

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