# Test Yourself

## True or False

#### Feedback

**True**

**It provides a range of plausible values for the “true” population parameter based on the sample data.**

#### Feedback

**False**

**A CI uses the standard error, this is a measure of the random sampling variation which is intuitively dependent on sample size. So sample size is used to calculate all confidence intervals.**

#### Feedback

**False**

**The CI will be too narrow as these observations are not independent. Children within each family are likely to be more similar with respect to CO levels and other factors that might influence CO.**