Chapter 11 11.3 Use and Abuse of Tests. Choosing a Level of Significance How plausible is H 0 ? What are the consequences of rejecting H 0 ? There is.

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Presentation transcript:

Chapter Use and Abuse of Tests

Choosing a Level of Significance How plausible is H 0 ? What are the consequences of rejecting H 0 ? There is no sharp border between “statistically significant” and “statistically insignificant,” only increasingly strong evidence as the P-value decreases.

Example Statistical Significance and Practical Importance Wound Healing Time Page 717

Cautions Statistical significance is not the same thing as practical importance. The foolish user of statistics who feeds the data to a calculator or computer without exploratory analysis will often be embarrassed.

Don’t Ignore Lack of Significance Reducing HIV transmission; Example Psychology journals; Example When planning a study, verify that the test you plan to use has a high probability of detecting an effect of the size you hope to find.

Statistical Inference Is Not Valid for All Sets of Data Does music increase worker productivity; Example If we analyze data that do not arise from randomized samples or experiments, we must have confidence in the use of probability to describe the data.

Beware of Multiple Analyses Cell phones and brain cancer; Example 11.17

Assignment Page 721; – 11.48

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