Flashcards
PSY1205_Variability and Variance
Cards in this deck (6)
- 1What is VARIANCE?means are identical, but there’s an important difference: variability.
-> Variance is (basically) average distance from the mean.
--> variance is the average (squared) difference from the mean - 2What is the formula for variance?
- 3What are Biased Estimates?the variance of a sample tends to under-estimate the population variance
- 4How do you fix biased estimates?use N-1 in the formula
- 5When do you use Wilcoxon rank-sum test vs. Variance test?Group differences in central tendency
-> Wilcoxon rank-sum test
Group differences in variability
-> Variance test - 6What are "Degrees of Freedom"?the number of numbers free to vary given what we know about them
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- Psychologie (PSY1205_Introduction to Statistics) Flashcards on PSY1205_Variability and Variance, created by Cat Fischer on 23/12/2017.
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- Cat Fischer
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