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Econ 203: Midterm 1
F-Test (for difference in variance)
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use for difference in variances/dispersion
Ho= all same
Ha= at least 2 different |
F-Test do not reject null
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p>alpha
perform an independent sample t-test for difference in means (equal) |
F-Test reject null
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p<alpha
perform an independent sample t-test for difference in means (unequal) |
z-test for population proportion
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testing for how one population compares to a constant
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chi square test
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comparing a population variance to a constant value
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z test for difference in proportions
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interested in two different populations, want difference
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independent samples t-test for difference in mean - unequal variances
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when you reject the null for an F test
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paired sample t-test for difference in means
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unknown standard deviation, testing the average difference
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independent samples t test for difference in means - equal variances
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do not reject null for F test (samples not different), comparing means of 2 populations without knowing variance
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F-test difference in means
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comparing means of more than 2 populations
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z test for difference in means
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comparing two population means and know variance
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t test for the mean
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testing mean of one population, standard deviation unknown
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z test for mean
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testing mean of one population, standard deviation known
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F test
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ratio of two variances
Ho --> ratio=1 |