1.Explain any problems likely to cause confounding, and suggest how they could be avoided: in a comparison of gasoline with different octane ratings, 24 vans are driven with 87 octane gasoline, and 28 SUVs are driven with 91 octane gasoline. After each vehicle has been driven for 250 miles, the amount of gasoline consumed is measured.

2.Explain which of the 8 guidelines for evaluating a statistical study might be most relevant: In a survey of 1,200 college students, each was asked whether they are a good person.

3.The following presents a headline in a local newspaper, as well as the story summary. Discuss whether the headline accurately represents the story.

Headline: "Drugs Shown in 98% of Movies"

Story Summary: A "government study" claims that drug use, drinking, or smoking was depicted in 98% of top movie rentals (Associated Press).