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A 2011 gallup poll of...

A 2011 gallup poll of 1038 randomly selected adults in the U.S. Each subject was asked this question, "in general, how harmful do you feel secondhand smoke is to adults?"

Results: Very harmful 52%

somewhat harmful 33%

not too harmful 9%

no opion 1%

a) if you read these results would you question this accuracy data at all? Why?

b)similar poll conducted in 1994 with following results:

very harmful 36%

You want to know if the rate in 2011 (52%) is higher than 1994 (36%) because of random chance or because the proportion of neg opinions about second had smoke actually increased between 1994 and 2011.

c) find p-value

d) conduct hypothesis test

e) can hypothesis test be used to verify that the 36% rate from 1994 has not changed? why?

Results: Very harmful 52%

somewhat harmful 33%

not too harmful 9%

no opion 1%

a) if you read these results would you question this accuracy data at all? Why?

b)similar poll conducted in 1994 with following results:

very harmful 36%

You want to know if the rate in 2011 (52%) is higher than 1994 (36%) because of random chance or because the proportion of neg opinions about second had smoke actually increased between 1994 and 2011.

c) find p-value

d) conduct hypothesis test

e) can hypothesis test be used to verify that the 36% rate from 1994 has not changed? why?

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