Cocaine users commonly snort the powder up the nose through a rolled-up paper cu

Question

Cocaine users commonly snort the powder up the nose through a rolled-up paper currency bill. A particular country has a high rate of cocaine use, so it's not surprising that paper currency in this country often bears traces of cocaine. The researchers note that we can't tell whether the bills had been used to snort cocaine or had been contaminated in currency-sorting machines The plus four method is particularly useful when there are no successes or no failures in the data. The study of this country's currency described above found that in a city, all 16 of a sample of 16 bills had cocaine traces. (a) what is the sample proportion of contaminated bills? what is the large-sample 95% confidence interval for p? to b) Find the plus four estimate p and use it to find the plus four 95% confidence interval forp. These results are more reasonable n ths st ation (Round your answers to three decimal places.) .769 to 1.031

Explanation / Answer

b) Here we need to take care of the fact that the proportion can't be greater than 1 so even though the confidence interval includes the values that are greater than 1, the upper confidence limit will be 1.

The answer is 1

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