Question

E-cigarette use among the youth. E-cigarettes are battery operated devices that aim to mimic standard cigarettes. They don't contain tobacco but operate by heating nicotine into a vapor that is inhaled. Here is an excerpt from a 2014 UK public health report in which the use of e-cigarettes among children (ages 11 to 18) is summarized: In terms of prevalence, among all children "ever use" of e-cigarettes was low but did increase between the two surveys. In 2011 it was 3.3%, rising to 6.8% (p<0.05) in 2012. Current use (>1 day in the past 30 days) significantly increased from 1.1 to 2.1% (p<0.05), and current "dual use" (e-cigarettes and tobacco) increased from 0.8 to 1.6% (p<0.05) from 2011 to 2012. The report doesn't state the null and alternative hypotheses for each of the reported estimates with P- values. What are the implicit competing hypotheses? Can you say that the changes in usage are significant at the 1% level? Explain.

Answer 1

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