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Unformatted text preview: cell phone usage (and presence/absence of cancer). 9.17. (b) This is an experiment (a treatment is imposed), but there is no control group for comparison. 9.18. (b) There are two factors, each with two levels, which yields the four treatments listed. 9.19. (a) We choose randomly from all subjects at once (rather than grouping them in blocks), and each subject gets one treatment (there is no pairing). 9.20. (c) The response variable is the effect we want to observe: How blood pressure changes in response to the various treatments. 9.21. (a) Each of the 36 subjects needs a label. 9.22. (b) The communities are paired up, then one is chose to have the advertising campaign. 9.23. (a) The choice should be made randomly. 9.24. (b) This was a (matched pairs) experiment, but in order to give useful information, the subjects should be chosen from those who might be expected to buy this car....
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- Spring '10