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Political Statistics
Final Exam
| Question | Answer |
|---|---|
| Test of Statistical Significance | Helps you decide whether an observed relationship b/w an IV and a DV exists in the population or whether it could have happened by chance. |
| Null Hypothesis (H0) | States there is no relationship b/w the IV (X) and the DV (Y) in a population. Any relationship that may exist is by random sampling error or chance. |
| Research/Alternative Hypothesis (H1) | State there is a relationship between the two variables (X and Y). Not by chance. |
| Type I Error | Occurs when the researcher concludes there IS a relationship when, in fact, there is not one. |
| Type II Error | Occurs when the researcher infers that there IS NOT a relationship when, in fact, there is one. |
| Correlation Analysis | Produces a 'measure of association'; Known as Pearson's r; Gauges the direction and strength of a relationship b/w two interval-level variables. |
| Regression Analysis | Produces a 'statistic' or 'regression coefficient'; Estimates the size of the effect of the IV on the DV. |
| Regression Line | y = a + b(x) |
| Multicollinearity | Occurs when the IV's are related to each other so strongly that it becomes difficult to estimate the partial effect of each IV on the DV. |
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