Stats- confidence interval
1. Confidence Interval – proportion -A study by the University of Michigan found that one in five 13 and 14 years olds is a sometime smoker. To see how the smoking rate of the students at a large school district compared to the national rate, the superintendent surveyed two hundred 13 and 14 year old students and found that 23% said they were sometimes smokers. Find the 95% confidence interval of the true proportion and compare this with the University of Michigan’s study.
1. What is p? ______
2. Find p and q
3. Find critical value, α.
4. Find margin of error:
5. Find the confidence interval: CI = P
Write the conclusion
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