ad 186 - nonparproblems20.pdf (1.57 MB)eviousCHAPTER 30 STATISTICAN TECHNIQUES FOR ORDINAL DATA: MANN-WHITNEY, MILCOKOH, KRUSKAL-WALLIS, AND FRIEDNAN TESTS7. Occasionally, researchers measure a behavior that hasextremely large variability. In these situations, thevyrirblity of the sores cin översh.—ans "dildifferences in the cuts so that it is essentially impossibleto find significant difforms. If the scores incconverted ja ranks, however, the problems of lancvarsability can be eliminata! Consider the followingexample: A researcher is examing how suncion ofailure on a task ein influerer an individual's futurperformance on the same link. A roup of participantsis given 10 trientes to work on a problem solving link.Based on their performance, they are classified ahaving either succeeded or failed. The participants arthen given a second chance to work on a similar beskwith no time limit. The researcher simply records howlong each person persists on the task before stoppingThe scores ĉin minutes) for the two groups are asHoInitial success. 13, 20, 14, 7, 19, 23, 5K, 10Initial Exilire 157,365, 4, 32With the large variability in the scores, all wouldconclude thu there is no significant differcier betweesthe two groups How vi, you can rank the scrs aniuse a Man Whitegy lost to evaluate the differeheann le lwo pups. Perform the Mann Walleybest using the 05 level of significance8. One sumption for panenetric tests with independentmeasures lila is that the differed freiben, conditionhurve the same variance Chomogeneity of varianceassumption) However, a trement ells, tha erinThe man øllen - » Sæm the variaxlity 1.15.situation, the parameinc rest or ANOVA OLjustified Mann Whitney best should be used. Thefollowing data represent an example of this situationSample AlTreatment 2Samplewatched Sesame Street as 5-year-old children hadhigher grades than their peers who did not watch theMOENIM. The results of an, independent-mezsures i lestindicated a significant difference between the twogroups. The data are repeated benea. Does a Mann-Whitney test also indicate asignifican, Jill-uce la jiye US level ofspalilianxb. The Kruskal-Wallis test is usually intended forevaluating the differences among three är nxseparate samples. However, the lest can be usedwith only two samples. Use the Kruskal-Wallis testwith a – 15 in evaluate the difference bwiiwa thetwo groups of students. Is the result consistent withThe cutcome of th. Mann-Whitney test?Average ligh School GradeWatchedSetaine StreetMYDid Not Watch10 Problems 22 from Chapter 11 described a researchstudy comparing the acconcy of Olympic marksmenfor shots fired during a heartbeat with the accuracy forLas fired between heartbeats (Pelion, 1981). Therepeiled meses est showed a significant differencebetween the two conditions Transform the scoresles ordinal data (ranks) and use a Wilcxton text with05 to determine whether the urdinul test producesThe same sixclusion. The call tre ki þ6 MEParticipantDuringHarboatsHeartbeansDa. Compute the mean and variance for each sample.Note the difference between the two sampleYUN DEVEh. Use a Mann-Whitney test, with a .05, to test fora significant difference between the two treatments.9. Example 10.1 (page 318) reported research resultsdemonstrating that high school students who regularly2111. Problem 24 from Chapter 11 described a studyevaluating the effect of a drug (MAO inhibitori brtealing nightmares for valoran with post-traumaticstress disorder (PTSD). The reposted measures 1 þesshowed significant improvement after patients took thePage

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ad 186 - nonparproblems20.pdf (1.57 MB)eviousCHAPTER 30 STATISTICAN TECHNIQUES FOR ORDINAL DATA: MANN-WHITNEY, MILCOKOH, KRUSKAL-WALLIS, AND FRIEDNAN TESTS7. Occasionally, researchers measure a behavior that hasextremely large variability. In these situations, thevyrirblity of the sores cin översh.—ans &#34;dildifferences in the cuts so that it is essentially impossibleto find significant difforms. If the scores incconverted ja ranks, however, the problems of lancvarsability can be eliminata! Consider the followingexample: A researcher is examing how suncion ofailure on a task ein influerer an individual's futurperformance on the same link. A roup of participantsis given 10 trientes to work on a problem solving link.Based on their performance, they are classified ahaving either succeeded or failed. The participants arthen given a second chance to work on a similar beskwith no time limit. The researcher simply records howlong each person persists on the task before stoppingThe scores ĉin minutes) for the two groups are asHoInitial success. 13, 20, 14, 7, 19, 23, 5K, 10Initial Exilire 157,365, 4, 32With the large variability in the scores, all wouldconclude thu there is no significant differcier betweesthe two groups How vi, you can rank the scrs aniuse a Man Whitegy lost to evaluate the differeheann le lwo pups. Perform the Mann Walleybest using the 05 level of significance8. One sumption for panenetric tests with independentmeasures lila is that the differed freiben, conditionhurve the same variance Chomogeneity of varianceassumption) However, a trement ells, tha erinThe man øllen - » Sæm the variaxlity 1.15.situation, the parameinc rest or ANOVA OLjustified Mann Whitney best should be used. Thefollowing data represent an example of this situationSample AlTreatment 2Samplewatched Sesame Street as 5-year-old children hadhigher grades than their peers who did not watch theMOENIM. The results of an, independent-mezsures i lestindicated a significant difference between the twogroups. The data are repeated benea. Does a Mann-Whitney test also indicate asignifican, Jill-uce la jiye US level ofspalilianxb. The Kruskal-Wallis test is usually intended forevaluating the differences among three är nxseparate samples. However, the lest can be usedwith only two samples. Use the Kruskal-Wallis testwith a – 15 in evaluate the difference bwiiwa thetwo groups of students. Is the result consistent withThe cutcome of th. Mann-Whitney test?Average ligh School GradeWatchedSetaine StreetMYDid Not Watch10 Problems 22 from Chapter 11 described a researchstudy comparing the acconcy of Olympic marksmenfor shots fired during a heartbeat with the accuracy forLas fired between heartbeats (Pelion, 1981). Therepeiled meses est showed a significant differencebetween the two conditions Transform the scoresles ordinal data (ranks) and use a Wilcxton text with05 to determine whether the urdinul test producesThe same sixclusion. The call tre ki þ6 MEParticipantDuringHarboatsHeartbeansDa. Compute the mean and variance for each sample.Note the difference between the two sampleYUN DEVEh. Use a Mann-Whitney test, with a .05, to test fora significant difference between the two treatments.9. Example 10.1 (page 318) reported research resultsdemonstrating that high school students who regularly2111. Problem 24 from Chapter 11 described a studyevaluating the effect of a drug (MAO inhibitori brtealing nightmares for valoran with post-traumaticstress disorder (PTSD). The reposted measures 1 þesshowed significant improvement after patients took thePage

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