# Stats- confidence interval

**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

## Tutor Answer

Brown University

1271 Tutors

California Institute of Technology

2131 Tutors

Carnegie Mellon University

982 Tutors

Columbia University

1256 Tutors

Dartmouth University

2113 Tutors

Emory University

2279 Tutors

Harvard University

599 Tutors

Massachusetts Institute of Technology

2319 Tutors

New York University

1645 Tutors

Notre Dam University

1911 Tutors

Oklahoma University

2122 Tutors

Pennsylvania State University

932 Tutors

Princeton University

1211 Tutors

Stanford University

983 Tutors

University of California

1282 Tutors

Oxford University

123 Tutors

Yale University

2325 Tutors