PSYC 355 Independent Samples and Paired Samples T-Tests Analysis in SPSS

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PSYC 355Page1of7PSYC 355 Independent Samples and Paired Samples T-Tests Analysis inSPSSSPSSHOMEWORK2INSTRUCTIONSINDEPENDENTSAMPLEST-TESTSPart1:Green&Salkind:Lesson 24,Exercises 1–5The following helpful tips are numbered to correspond with theexercise number to which theyrefer:1.Type these values out underneath your copied and pasted output.(3pts)Group StatisticsWeightclassificationNMeanStd. DeviationStd. Error MeanTime spent eating Big Macspecials in secondsoverweight10589.0042.61513.476normal weight30698.4082.94915.144Independent Samples TestLevene's Test forEquality ofVariancest-test for Equality of MeansFSig.tdfSig. (2-tailed)MeanDifferenceStd. ErrorDifference95% ConfidenceInterval of theDifferenceLowerUpperTime spenteating Big Macspecials insecondsEqualvariancesassumed2.745.106-3.97538.000-109.40027.522-165.116-53.684Equalvariances notassumed-5.39730.828.000-109.40020.272-150.754-68.046T-value for equal variances assumed:-3.95T-value for equal variances not assumed:-5.3972.Instead of identifying these values on your output, as the text states, write them in yourWord file aswritten answersfor #2 a, b, and c.(3pts, 1 point for each letter)

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PSYC 355Page2of7a.The mean eating time for overweight individuals was 589 seconds.b.The standard deviation for normal weight individuals was 82.95.c.c. The F-statistic, which shows if the assumption of homogeneity of variances hasbeen violated, was 2.745 with a p-value of 0.106. The assumption was notviolated3.The effect sizestatistic must be computed by hand (or calculator). Use the second“easier” formula ford,found in the section on Effect Size Statisticsin this lesson.(3pts)d = t√((N1+N2) / (N1N2))d =-3.975√((10+30) / (10*30))d =-3.975√(40/300)d =-3.975 (0.365)d =-1.4514.An independent t-test showed that there was a significant difference between the meaneating time for the two groups,t(38) =-3.975,p< 0.001,d=-1.451, in this sample. Themean eating time of a Big Mac special for overweight individuals (M= 589,SD= 42.6)was shorter than the mean eating time for normal weight individuals (M= 698,SD=82.9). The alternative hypothesis that overweight individuals take less time to eat a BigMac than normal weight individuals should be accepted. The null hypothesis that there isno difference in the eating time of the two groups should be rejected.5.Create aboxplot(not an error bar graph) using the following steps(covered also inLesson 21).(3pts)Time spent eating Big Mac specials in secondsby Weight Category

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