## Lesson 10: Estimation with Confidence Intervals

October 11, 2015

**Mon, Oct 12**

Review:

Presentation:

- Estimation with Confidence Intervals
- Sample Mean =
**Point Estimate** - Use Standard Normal Curve and Z-table to calculate
**Confidence Interval**

- Sample Mean =

Activity:

- During class we measured heights (
**n=50**) and calculated a**mean classroom height of 68.5 inches**. - Assume the
**standard deviation for all heights is 4.7 inches**. **Produce a 95% confidence interval**to estimate average height for the student population.- Using the same information
**produce a 90% confidence interval.**

Assignment:

- Complete the following practice problems,
**produce a 95% AND a 90% confidence interval****for each set**of parameters.- sample mean = 123.9, population standard deviation = 19.8 and n = 82
- sample mean = 23, population standard deviation = 3.5 and n = 60
- sample mean = 56.7, population standard deviation = 12.1 and n = 49
- sample mean = 3.5, population standard deviation = 0.86 and n = 121