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A telephone survey commissioned by the New Zealand Health service found that 16% of New Zealanders consume more than 10 alcoholic beverages /week. The data were collected from random selection of 2006 adult NZers. To estimate the population proportion, the statisticians computed a 95% CI.

a. Find the 95% CI for the sample.

b. What problems might there be in interpreting these results?

c. **E.C. Suppose you wished to reduce the margin of error of the CI for this study by half. What must the sample size be for the next study in order to do so?

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