| Hand in Friday p. 229 9.27 wine, beer, spirits , diagram design. p. 230 9.32 a only headache prevention design p. 231 9.33 fabric finishing, design p. 230, 9.28 marijuana Use the Simple Random Sample Applet, see Day 22 for details, to find who to put in the two groups. (Also: pick just the first 3 people for the "weak" group using Table B at line 131.Postpone this if you don't know how.) p230, 9.30 TV ads Use the Simple Random Sample Applet, see Day 22 for details. p. 234, 9.48 Randomization avoids bias p. 222, 9.8 conserving energy p. 223, 9.9 exercise/heart p. 233, 9.45 a,b,c,e antioxidants (review) DO p. 243 #7 anonymity or confidentiality? (read pp. 237-8) - - - - - - - - - - -Postpone Ch. 9 problems below- - p. 233, 9.45 d antioxidants (review) p. 223 9.10 significance on Monday p. 226, 9.13 hand strength, MP p. 231, 9.35 forest CO2 p. 226, 9.15 teaching techn. Why might I call this a matched pairs rather than a general block design? Don't actually do the randomization, but think about what ought to be done; we'll talk about it. p. 232, 9.40 TV ads, block design. Use the Applet, to assign your subjects. Number your Women and your Men, and show their numbers as well as the group they're in. p. 229, 232, 9.27 and 9.39 wine, beer, spirits two ways - - - - - - - - - - Hand in Friday Yes: Hand in answers to these questions on the "Placebo Effect" articles (outside my door/on reserve): a) Give two examples of the placebo effect (from the article!) b) What do researchers believe causes the placebo effect? c) In the separate article: "Pill will make you feel better...," what country was surveyed? - - - - - - - - - - - - Hand in Monday Yes: "Ethics": Read Data Ethics, pp 235-242. Find at least one other person in the class, and together discuss one of these questions. Write up your answers (If you have consensus, fine! If you disagree, say who thinks what). pp. 242-245, # 4 or 5 or 9 or 11 or 13 or 14 or 17 |
Read, to discuss p. 234, 9.47 explaining medical research p.233 9.41 prayer & meditation (clarification:
they help the person praying; careful experiments to see if they help a
person prayed for have not shown positive results.) Postpone: |
Optional p. 230, 9.29 red wine. This is a complex experiment with different amounts of polyphenols in different kinds of liquids. Doesn't fall neatly into our Factors-value structures? Think about it a bit... p. 226, 9.14 matched and not, more practice |
Lurking/confounding variables:
Control--how?
Nothing except experimental treatment should differentially affect
response.
Placebo effect?! use placebo as control group...
Compare responses
under several treatments,
look at differences.
Randomized comparative experiment : Diagrams
of design, Moore pp. 218-19: shows where randomizing
happens, how many to each treatment, what the treatments are.
Completely randomized: all exp. units allocated at random
among
the treatments.
Use enough subjects
for each treatment so
that you can
"average out" chance variation in the subjects.
Principles of designing an experiment: Control as much as you can, to make all
the same except for treatments, Randomize
the rest; Use enough subjects
to average out bad "chance"
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