Go over test?. Testing a Claim Chapter 9 Significance Test.

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Presentation transcript:

Go over test?

Testing a Claim Chapter 9

Significance Test

Stating Hypotheses

For Example…

One-sided vs. Two-sided The alternative hypothesis is one-sided if it states that a parameter is larger or smaller than the null hypothesis. It is two-sided if it states that the parameter is different from the null hypothesis (it could be larger or smaller).

P-Value

Example Mike is testing new golf clubs to see if they perform better than his old clubs. His average drive with the old clubs was 243 yards. When Mike was testing his new golf clubs, a significance test using the sample data produced a p-value of Interpret the P-value in context: Do the data provide convincing evidence against the null hypothesis? Explain.

In a nutshell…

Statistically Significant

Example A company has developed a new deluxe AAA battery that is supposed to last longer than its regular AAA battery, but these are more expensive to produce so the company would like to be convinced that they really do last longer. They know that the regular AAA battery last for 30 hours, on average. The company selects a SRS of 15 new batteries and uses them until they are completely drained. What are the hypotheses in question?

Example

Homework – YOU NEED TO PRACTICE THE HOMEWORK FOR THIS CHAPTER! Pg. 546 (1-17) Start together in class!