# cinfidence interval- stats

**Question description**

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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