# Lec30 Back to Confidence Intervals

### Tying the concepts of standard errors and confidence intervals together.

### Announcements

### Recall

**Thought Experiment**: Sample 3 students at random and get their (sample) mean age.**Question**: What value quantifies how much these sample means vary by?**Answer**: The standard error.

Random Sample | (Sample) Mean Age |
---|---|

Jack, Jared, Sam | 21.7 |

Wengel, Rebecca, Steven | 19.4 |

Stefan, Joccelyn, Sierra | 20.0 |

### In-Class

- Slides: Tying the concepts of standard errors and confidence intervals together.