An Associated Press story (August 25, 1998) about the lack of fluoride in most of the water supply in Utah quoted antifluoride activist Norma Sommer as claiming that fluoride may be responsible for AIDS, since the water supply in San Francisco is heavily fluoridated and that city has an unusually high incidence of AIDS. Describe how you could use this story to explain to someone who has never studied statistics that association need not imply causation.
Answer to relevant QuestionsConsider the cell phone Study 3 described in Example 1. a. Identify the response variable and the explanatory variable. b. Was this an observational study or an experiment? Explain why. Go to the Web site for the GSS, www.norc.org/GSS+Website/, click on Documentation, and then click on Sampling Design and Weighting. There you will see described the complex multistage design of the GSS. Explain how the GSS ...Use the Random Numbers applet on the text CD to select 10 of the 60 school district accounts described in Example 5. Explain how you did this, and identify the accounts to be sampled. More than 75% of Americans answer yes when asked, “Do you favor cracking down against illegal gun sales?” but more than 75% say no when asked, “Would you favor a law giving police the power to decide who may own a ...There have been anecdotal reports of the ability of duct tape to remove warts. In an experiment conducted at the Madigan Army Medical Center in the state of Washington (Archives of Pediatric and Adolescent Medicine 2002; ...
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