Mountain Biking May Reduce Fertility in Men, Study Says was the headline of an article appearing in

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“Mountain Biking May Reduce Fertility in Men, Study Says” was the headline of an article appearing in the San Luis Obispo Tribune (December 3, 2002). This conclusion was based on an Austrian study that compared sperm counts of avid mountain bikers (those who ride at least 12 hours per week) and nonbikers. Ninety percent of the avid mountain bikers studied had low sperm count, compared to 26% of the nonbikers. Suppose that these percentages were based on independent samples of 100 avid mountain bikers and 100 nonbikers and that these samples are representative of avid mountain bikers and nonbikers.
a. Using a confidence level of 95%, estimate the difference between the proportion of avid mountain bikers with low sperm count and the proportion for nonbikers.
b. Is it reasonable to conclude that mountain biking 12 hours per week or more causes low sperm count? Explain.
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