POL S 15 Lecture Notes - Lecture 14: Null Hypothesis, Statistical Significance, Test Statistic
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Hw assignment #5 will be due before thanksgiving. Sampling and statistical inference: examples of formal significance tests and profession. Formal significance test for regression of o-ring damage on temperature. Trying to relate damage of o-rings to temperature (negative relationship btw the two variables) Step 1: need a null hypothesis and an alternative hypothesis. The statistic in this is the slope (what captures the relationship betwee the variables) Focus on the slope (b), paying not much attention to the intercept in this step. Could be general: testing no relationship versus some relationsh. Step 2: level of significance (a): 5% [so we can find 95% confidence] Step 3: test statistic: "t-value", calculated by spss (standardized, or z-score of, slope) Standardizing the probability distribution; moving from slopes to z- Scores sional p btwn tween t in onship score of, are. Taking the slope, and standardizing it by calculating a z-score or t-valu.
