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Explained as a chance variation

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The gallup poll asks respondents how they would rate the honesty and ethical standards of people in different fields- very high, high, average, low, or very low. The percentage who rated clergy "very high or high" dropped from 60% in 2000 to 54% in 2005. This may be due to chance variation. (You may assume that in each year, the results are based on independent simple random samples of 1,000 persons each year. )

a. Should you make a one-sample z-test or a two-sample z-test? Why?

b. Formulate the null and alternative hypothesis in terms of a box model. Do you need one box or two? Why? How many tickets go into each box? How many draws? What do the tickets show? What do the null and alternative hypotheses say about the box(es)?

c. Can the difference between 60% and 54% be explained as a chance variation? Or was it the scandals? Or something else?

Reference no: EM131533810

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