1. Homework Questions?

2. Section 9.3 Tests about a Population Mean

3. One Sample t Test

4. Computing the test statistic and p-value of AAA batteries from section 9.1

5. Two-Sided Tests

6. Example – Health Streams  The level of dissolved oxygen (DO) in a stream or river is an important indicator of the water’s ability to support aquatic life. A researcher measures the DO level at 15 randomly chosen locations along a stream. Here are the results in mg/l:  A DO level below 5 mg/l puts aquatic life at risk. 4.535.043.295.234.135.504.834.40 5.426.384.014.662.875.735.55XX

7. Healthy Streams

8.  Do:  Conclude:

9. Healthy Streams  Given your conclusion, which kind of mistake – Type I or Type II error – could you have made? Explain what this would mean in context.

10. Again…look at a confidence interval…

11. Paired Data - Flip to page 581  Matched Pairs!  Only do (3, 4, 5)

12. Homework Pg. 587 (63-69 odd, 70, 73-79 odd, 91, 95, 96, 99-104)