According to the US Department of Health and Human Services, the percentage of adults who smoked cig

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

 

a.

0

 

b.

0.5

 

c.

infinity

 

d.

0.19

 

e.

1

 

 

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