Week 3 (2/10/05 - 2/17/05)
Good scientific practice . . . places the emphasis on
reasonable scientific judgment and the accumulation of evidence and not
dogmatic insistence of the unique validity of a certain procedure (Jerome
Cornfield)
PRELIM
- It is important to view the lab analysis in detail and holistically
What was the research question? (ANS: Does the unspecified diet affect bad
cholesterol?) What did you learn from your analysis? (ANS: Using various
techniques, we learned the groups had similar variances but group 1 had
significantly higher bad cholesterol levels.)
- The challenge of exercise 11.4 was to use various techniques to shed light
on air pollution levels at two independent sites. I believe the most
revealing analysis was the side-by-side stemplots (shared on WebCT on 2/6).
The F test of variances and t tests of means should be used to more-or-less
support what you saw in the plot.
- You may have a little more time (half an hour?) to complete your analysis.
(This time only!)
LECTURE: Ch 12: ANOVA -- presentation
slides (pdf format)
LAB2
UNIT 12 Exercises version
of 2/10 only