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Material Type: Notes; Class: Probability and Statistics; Subject: Economics; University: Vassar College; Term: Unknown 1989;
Typology: Study notes
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Parameter Estimator Mean of Variance of Estimated estimated Estimator Estimator Variance
Comparing two populations: Independent Samples
Which distribution to Use: Normal or t (Rules of Thumb)
Case I: Population Normal
Case II Population Non-normal
Case III Proportions
Differences in Means :Variances Unknown When testing hypotheses or finding confidence intervals involving differences in means there are two distinct cases to consider:
where
with degrees of freedom given by the following expression:
This is a messy expression to use. For the purposes of this course you should assume that degrees of freedom is equal to n 1 + n 2 - 2.
