# Lec31 Finishing Confidence Intervals

### Confidence intervals in practice.

### Announcements

### In-Class

- Slides: Confidence intervals in practice.
- Chalk talk
- Learning check:
- Let’s
**pretend**we don’t know the true mean mu = 68.3 inches - Using the
`resample()`

function, take a**single sample**(without replacement) of size $n=50$ of 50 OkCupid users’ heights`profiles$height`

. Assign this to an object`sample_50`

. - Using the
`mean()`

,`sd()`

, and`sqrt()`

functions, compute one confidence interval for mu. - Did your net catch the fish?

- Let’s