Probabilty and Statistics homework help please!?

Posted on 2014-04-22 06:09:00 in Statistics by ROBERT K

In december 2004, a report estimated that 20% of americans ages 16-20 drove under the influence of drugs or alcohol. A public health unit in new zealand plans a similar survey for young people of that age in new zealand. They want a 95% confidence interval to have a margin of 0.04.



a) find he necessary sample size if they expect results similar to those in the US.



b) suppose that in determining the sample size, they use the safe approach that set p=.50 in the formula for n.

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