Index of /faculty/kerns/video/STAT3743/111510

STAT 3743 Daily Outline

STAT 3743 Daily Outline

Up there should be four (4) files:

The WebM video is definitely the highest quality, but you need a compatible browser/player to watch it. See How to watch the video for instructions to get one.

2010-11-15 Mon

More about p-values

Standard error of the sample mean

Standard errors in general

For variances

Tests of hypothesis for a variance

Example: salary from RcmdrTestDrive

How to do it with R

sigma.test from the TeachingDemos package

For two means and/or two variances

For two means

Independent two-sample t-test (pooled)

Example: mean before by smoking in RcmdrTestDrive


  • two-sample z-test
  • large sample approximation

For two variances

Two-sample F-test

Example: variance of before by smoking in RcmdrTestDrive

How to do it with R

var.test from base R

Author: G. Jay Kerns

Date: 2010-12-03 15:01:17 EST

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