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: Battery Problem 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? Battery Problem Continued: Homework* Pg. 546 (1-17)*