Index of /faculty/kerns/video/STAT3743/110110

STAT 3743 Daily Outline

STAT 3743 Daily Outline

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2010-11-01 Mon

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


  • always round up

For proportions, little bit harder

  1. replace p with prior guess
  2. 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


  • null hypothesis
  • alternative hypothesis

Author: G. Jay Kerns

Date: 2010-11-05 14:47:19 EDT

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