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Conditions for Z-Tests and T-Tests

Author: Jonathan Osters

Source: Top Hat; Creative Commons: http://commons.wikimedia.org/wiki/File:Chapeauclaque.png Pool balls, tables and graph created by Jonathan Osters

Video Transcript
Terms to Know
t-test conditions

The data were collected in a random way, each observation must be independent of the others, and the sampling distribution must be normal or approximately normal

z-test conditions

The data were collected in a random way, each observation must be independent of the others, the sampling distribution must be normal or approximately normal, and the population standard deviation must be known