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Unformatted text preview: ePopulation Mean TwoPopulation Mean OnePopulation Variance TwoPopulation Variances MorethantwoPopulation Means TwoPopulation Variance
Ratio of Variances
2 1 2 2 It is also used before meantest if you do not know population variances are equal or unequal
test df statistic width CI df Ftest n1 F 1 n2
2 S1 2 S2 1 NO width (distribution is not symmetric)
2 2 S1 S2 F2 2 2 S1 S2 F1 2 Remark F 2 1 and F1 2 1
11 Statistical Inference Types of Test Exercises OnePopulation Mean TwoPopulation Mean OnePopulation Variance TwoPopulation Variances MorethantwoPopulation Means MorethantwoPopulation Means (ANOVA)
ANOVA is used to make inferences about the differences between the MEANS of TWO OR MORE populations However, the test is based on comparing variances instead of comparing means
The idea is to compare the variances under different assumptions on the means Hypotheses are always like this (for k populations) H0 H1
1 2 k At least two means are different from each other, or At least one mean is different from the others, or At least one equality in H0 does not hold
12 Statistical Inference Types of Test Exercises OnePopulation Mean TwoPopulation Me...
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 Spring '09
 PETRY
 Economics

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