Why? (b) Do we need one box model or two? Why? How many tickets go into each box? How many draws? What do the tickets show? (c) Can the difference between 60% and 54%
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 (see reference for study in the book). The percentage who rated clergy ”very high or high” dropped from 60% in 2000 to 54% in 2005. This may have been due to scandals involving sex abuse; or it may have been 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) Is this a one sample or two-sample test (ie. are we interested in learning about a single percentage or are we comparing two percentages)? Why? (b) Do we need one box model or two? Why? How many tickets go into each box? How many draws? What do the tickets show? (c) Can the difference between 60% and 54%
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