According to the US Department of Health and Human Services, the percentage of a

Question

According to the US Department of Health and Human Services, the percentage of adults who smoked cigarettes in 2011 was 19%. A survey of 500 adults taken in 2012 found 70 who smoke. The researcher is interested in finding evidence at the .05 significance level of a decrease from 2011 to 2012 in the proportion of US adults who smoke.

If the fraction of US adults who smoke is in fact 19%, what it the average or expected value of the test statistic?

0

0.5

infinity

0.19

1

0

0.5

infinity

0.19

1

Explanation / Answer

The expected value of the test z statistic is, by definition,

OPTION A: 0 [ANSWER]

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