### Math 151 , HW from Chapter 9, to work ahead with (after day 21)  This is all, very probably

HW:Read Chapter 9, first to p. 235.  Check p. 240: 9.19, 20, 21, 23 (obs/expt, factors)  : then 24 (choosing groups), 27 (cautions). Then read p. 236 on (other designs) Check 9.19, 22, 25, 26. You can do any time now:  Read Data Ethics, pp. 249-260. Next: Ch. 10 (Normal dist. is back)

 Hand in:( other/earlier work for Ch.9 is on Day 21) p. 231 9.9 a only more rain for CA,, diagram design. p. 244 9.37 a only headache prevention design (more than 1 factor) p. 243 9.36 fabric finishing, design(more than 1 factor) p. 243, 9.34 marijuana Use the Simple Random Sample Applet, see below 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 p. 231 9.9 b more rain for CA, Use theSimple Random Sample Applet. p230, 9.30 TV ads  Use the Simple Random Sample Applet, see below for details. ,, p. 247, 9.50 Randomization avoids bias p. 233, 9.12 conserving energy p. 246, 9.48 a,b,c,e antioxidants (review)  DO p. 258 #7 anonymity or confidentiality? (read pp. 252-3) - - - -- - - - -Significance & cautions- - - -  p. 246, 9.48 d antioxidants, significance (review)  p. 233 9.13 arsenic, significance p.235, 9.13 meditation & anxiety = = = =Other designs= = = = p. 238, 9.16 hand strength, MP p. 245, 9.42 forest CO2 , CR/MP p. 238, 9.18 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. 245, 9.44 Ultramarathon.    p. 246, 9.45 and 9.46 wine, beer, spirits two ways Read, to discuss  Ch. 9 p. 242, 9.31Obsn/expt + (explaining medical research) p.233, 9.11prayer & meditation (clarification: they help the person praying; careful experiments to see if they help a person praye d for have not shown positive results.) p. 246, 9.49 a herb p. 433, 16.33 (yes) Placebo effect = = = = = = Optional Ch. 9 Think about this one... p. 243, 9.35 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. 238, 9.17 matched and not, more practice

Picking groups with random number table: Table B. Pick "sample" of size 10 from the 30 for first treatment group.  Pick another "sample" of size 10 for 2nd treatment group, from the remainder.  The 10 remaining get the 3rd treatment.
Easier with  Simple Random Sample Applet.  Enter total number of subjects in "Population size", enter size of first group in "sample size", hit Reset, then Sample.  Write down the numbers for this sample, it's group 1.  Hit Sample again (DON'T reset) to choose the second group.  Write down the numbers, continue...

 Sievers home Math151-Fall11/Ch9HW.htm 11pm 10/13/11
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