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Unformatted text preview: not because it would have been much more expensive to do so, another reason why these researchers probably chose to analyze an observational study instead of performing an actual experiment on women age 65 and older. By saying they could not makes it seem as though they are incapable of controlling the caffeine intake so this answer choice would not be the best answer. I felt that iii was the best answer because this study is evidently observational because there was no control group since the researchers themselves did not manipulate the caffeine intake of women and block the experiment into a control group and groups in which caffeine intake was altered but rather analyzed existing data. Thank you for taking the time to reconsider my score and reviewing my test. Sincerely, Stephanie Lee 603904125...
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This note was uploaded on 01/21/2011 for the course STATS 10 taught by Professor Ioudina during the Spring '08 term at UCLA.
- Spring '08