Homework Questions?. Section 9.3 Tests about a Population Mean.

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Presentation transcript:

Homework Questions?

Section 9.3 Tests about a Population Mean

One Sample t Test

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

Two-Sided Tests

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 XX

Healthy Streams

 Do:  Conclude:

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.

Again…look at a confidence interval…

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

Homework Pg. 587 (63-69 odd, 70, odd, 91, 95, 96, )