Solution, p. 259 #17, b,c,d,e
A  comparative experiment. 
Response variable:  headache pain relief.
Factors (2):  Icewater/no ,  standard pain reliever
   Levels: 
      For Icewater/no,  2 levels:  Icewater, no water (or maybe room temperature water, doesn't say)
       For standard pain reliever;  2 levels:  pain reliever (standard dose),  placebo (0 dose)

Treatments: 4:  each level of Icewater/no combined with each level of painreliever.

	pain reliever	placebo
Ice water	Treatment 1	Treatment 2
No ice water	Treatment 3	Treatment 4

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