ࡱ> 574a 'bjbjWW 4V55 8>TlwA^ZXXXX333@@@@@@@$CFrA33333AXX1A36XX@3@v=@X,i>"@GA0wA>FKFD@@F@$3333333AA333wA3333F333333333 : More Chapter 21 (Error and Power) Meaning of the Terms Fail to Reject H0 and Reject H0 TermMeaningFail to reject H0 There is not enough evidence in the data (and the test being used) to justify a rejection of H0. This means that we retain H0 with the understanding that we have not proved it to be true beyond all doubt.Reject H0There is enough evidence in the data (and the test employed) to justify rejection of H0. This means that we choose the alternate hypothesis Ha, with the understanding that we have not proved Ha to be true beyond all doubt. Probabilities Associated with a Statistical Test Our DecisionTruth of H0 And if we accept H0 as true And if we reject H0 as falseH0 is trueCorrect decision, with corresponding probability  EMBED Equation.DSMT4 Type I error, with corresponding probability  EMBED Equation.DSMT4 , called the level of significance of the testH0 is falseType II error, with corresponding probability  EMBED Equation.DSMT4 Correct decision, with corresponding probability  EMBED Equation.DSMT4 , called the power of the test Example 1: For each of the following, describe the Type I and Type II errors: Discuss which error you think is more serious as well. Criminal trial.  EMBED Equation.DSMT4  Not Guilty  EMBED Equation.DSMT4  Guilty Type I: The defendant is not guilty but found guilty. Type II: The defendant is guilty but found not guilty. Going to a doctor when you feel sick.  EMBED Equation.DSMT4  You are well.  EMBED Equation.DSMT4  You are sick. Type I: You are well but diagnosed sick. Type II: You are sick but diagnosed well. FDA: Approval of a New Drug  EMBED Equation.DSMT4  Drug has no effect.  EMBED Equation.DSMT4  Drug is effective. Type I: Drug is not effective but found effective. Type II: Drug is effective but found not effective. Example 2: p.501 #16 Spam filters try to sort your e-mails, deciding which are real messages and which are unwanted. One method used is a point system. The filter reads each incoming e-mail and assigns points to the sender, the subject, key words in the message, and so on. The higher the point total, the more likely it is that the message is unwanted. The filter has a cutoff value for the point total; any message rated lower than that cutoff passes through to your inbox, and the rest, suspected to be spam, are diverted to the junk mailbox. We can think of the filters decision as a hypothesis test. The null hypothesis is that the e-mail is a real message and should go to your inbox. A higher point total provides evidence that the message may be spam; when theres sufficient evidence, the filter rejects the null, classifying the message as junk. This usually works pretty well, but, of course, sometimes the filter makes a mistake. When the filter allows spam to slip through into your inbox, which kind of error is that?  EMBED Equation.DSMT4  The email is not junk.  EMBED Equation.DSMT4  The email is junk. Type II; the truth is the email is junk but sent to inbox anyway. Which kind of error is it when a real message gets classified as junk? Type I; the email is not junk, but sent to junk mail anyway. Some filters allow the user (thats you) to adjust the cutoff. Suppose your filter has a default cutoff of 50 points, but you reset it to 60. Is that analogous to choosing a higher or lower value of  EMBED Equation.DSMT4  for a hypothesis test? Explain. This is similar to lowering the alpha level. It takes more evidence to reject the null and classify the email as junk. What impact does this change in the cutoff value have on the chance of each type of error? The probability of a Type I decreases (lower alpha) and the probability of a Type II increases. Example 3: p.501 #18 Consider again the points-based spam filter described in Exercise 16. When the points assigned to various components of an e-mail exceed the cutoff value youve set, the filter rejects its null hypothesis (that the message is real) and diverts that e-mail to a junk mailbox.  EMBED Equation.DSMT4  The email is not junk.  EMBED Equation.DSMT4  The email is junk. In this context, what is meant by the power of the test? The power of the test is the ability of the filter to detect spam. It is the probability that the test will correctly send an email to the junk mailbox WHEN the email is indeed spam. What could you do to increase the filters power? Lower the cutoff score (this would be analogous to increasing the alpha level). Whats the disadvantage of doing that? If the cutoff score is lowered, the risk of a Type I error increases so a larger number of good emails will end up in the junk mailbox. Example 4: p.502 #22 Production managers on an assembly line must monitor the output to be sure that the level of defective products remains small. They periodically inspect a random sample of the items produced. If they find a significant increase in the proportion of items that must be rejected, they will halt the assembly process until the problem can be identified and repaired. In this context, what is a Type I error?  EMBED Equation.DSMT4  The assembly process is working fine.  EMBED Equation.DSMT4  The assembly process is producing defective items. The truth is the process is working fine but managers determine it is not. In this context, what is a Type II error? The truth is the assembly process is producing defective items but managers determine it is working fine. Which type of error would the factory owner consider more serious? Type II; defects caught in the factory are generally cheaper to correct than defects found after the point of sale. Which type of error might customers consider more serious? Type II; customers dont want to purchase defective items. Note: the power of the test in this scenario is the probability that the test will, in light of some true alternative, correctly reject the null hypothesis. In context, given the factory is producing defective items, the probability the test will correctly identify that. Example 5: p.502 #26 Highway safety engineers test new road signs, hoping that increased reflectivity will make them more visible to drivers. Volunteers drive through a test course with several of the new- and old-style signs and rate which kind shows up the best. Is this a one-tailed or a two-tailed test? Why?  EMBED Equation.DSMT4  Reflective signs are not more visible.  EMBED Equation.DSMT4  Reflective signs are more visible. One-tailed; we want to test if the signs are MORE visible not that the visibility is different. In this context, what would a Type I error be? The truth is reflective signs are not more visible but we decide they are. In this context, what would a Type II error be? The truth is reflective signs are more visible but we decide they are not. In this context, what is meant by the power of the test? With respect to some true alternative, the power of the test is the probability that the test will correctly reject the null and determine that reflective signs are more visible. If the hypothesis is tested at the 1% level of significance instead of 5%, how will this affect the power of the test? If the alpha level decreases, so does the probability of a Type I error. Since the probability of a Type I error is decreasing, the probability of a Type II error will increase. Since the probability associated with the power of the test is the complement of a Type II error, the power will decrease as well. The engineers hoped to base their decision on the reactions of 50 drivers, but time and budget constraints may force them to cut back to 20. How would this affect the power of the test? Explain. Larger sample sizes will result in more power. Decreasing the sample size will decrease the power of the test.     "HIVWvwS T    ! 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