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In 2005 the New Jersey Adult Tobacco Survey found that 22.5% of 464 blacks surveyed said that they smoked cigarettes while 18.3% of 2449 white respondents reported smoking.

a) Create a 90% confidence interval for the difference in the percentage of smokers between black and white adults in New Jersey.

b) Does this survey indicate a race-based difference in smoking among American adults? Explain, using your confidence interval to test an appropriate hypothesis.

c) What alpha level did your test use?

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Statistics and Probability, Statistics

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