STAT 3743 Daily Outline
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Welch-Aspin interval explained
How to do it with R
Confidence intervals for proportions
Examples of proportions
The asymptotic z-interval for proportions
Example: SRS(4791) from binom, find 95% CI for p
Score interval: see book
Confidence intervals (asymptotic) for two proportions
One-sided CIs for p
How to do it with R
Sample size
margin of error, E
sample sizes for means, easy
Example: find n such that x-bar plus/minus E is 95% CI
Remarks
- always round up
For proportions, little bit harder
- replace p with prior guess
- replace p(1 - p) with 1/4, can't do worse
Example: monkeys who don't like bananas, find sample size for proportion, both methods
Sample size for small pop'ns, use hypergeometric distribution
Hypothesis Testing
For proportions
Example: shotgun machine, want to improve performance, install thing-a-majig
Terminology
- null hypothesis
- alternative hypothesis
Date: 2010-11-05 14:47:19 EDT
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