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Unformatted text preview: Twosided test I H : 2 , 400 against H a : &gt; 2 , 400 is called onesided test, because the alternative hypothesis only has one direction. I a. One tailed (upper tailed) b. One tailed, (lower tailed) c. Two tailed. I Remark: The tail is in the direction of the alternative hypothesis. I The real difference from onesided test is the rejection region. ProblemP.360 Chapter 8 I Problem: (The effect of drugs and alcohol on the nervous system ) Suppose a research neurologist is testing the effect of a drug on response time by injecting 100 rats with a unit dose of the drug, subjecting each rat to a neurological stimulus, and recording its response time. The neurologist knows that the mean response time for rats not injected with drug is 1.2 seconds. She wishes to test whether the mean response time for druginjected rats differs from 1.2 seconds. Set up the test of hypothesis for this experiment, using = . 01. I Can somebody guess what the rejection region should be? onesided or twosided? Some comments and pvalue I Rejection region: For a twosided test with level , the critical values (percentiles) are found using / 2, instead of . This is very important to keep in mind.....
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This note was uploaded on 06/06/2011 for the course STAT 515 taught by Professor Zhao during the Spring '10 term at South Carolina.
 Spring '10
 Zhao

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