An Associated Press story (June 13, 2002) reported, “A survey of teens conducted for the Partnership for a Drug Free America found kids who see or hear antidrug ads at least once a day are less likely to do drugs than youngsters who don’t see or hear ads frequently. When asked about marijuana, kids who said they saw the ads regularly were nearly 15 percent less likely to smoke pot.”
a. Discuss at least one lurking variable that could affect these results.
b. Explain how multiple causes could affect whether a teenager smokes pot.