1. 1 Confidence Intervals for Means

2. 2 When the sample size n< 30 case1-1. the underlying distribution is normal with known variance case1-2. the underlying distribution is normal with unknown variance case1-3. the underlying distribution is not normal When the sample size n case2-1. the variance of underlying distribution is known case2-2. the variance of underlying distribution is unknown

3. 3 case1-1. the underlying distribution is normal with known variance

4. 4

5. 5 case1-2. the underlying distribution is normal with unknown variance

6. 6

7. 7 case1-3. the underlying distribution is not normal

8. 8 case2-1. the variance of underlying distribution is known

9. 9 case2-2. the variance of underlying distribution is unknown

10. 10