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Directional hypothesis
-predict change of direction
-critical region established on only one tail
e.g. one tailed test
Non-directional
-Do not predict change of direction
-critical region established
e.g. two tailed test
one tailed test
-indicates probability in one tail
e.g. if x=0.05%, 5% in one tail
two tailed test
x/2 to indicate probability in each tail
e.g. 0.05=0.025 in each tail
degrees of freedom
-components that are free to vary within a system
- mean
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