Danielle Symons Downs and David abwender (2002) evaluated soccer players and swi
ID: 3338918 • Letter: D
Question
Danielle Symons Downs and David abwender (2002) evaluated soccer players and swimmers to determine whether the routine blows to the head experienced by soccer players produced long-term neurological deficits. In the study neurological test were administered to mature soccer players and swimmers and the results indicated significant differences.
In a similar study a researcher obtained the data shown in the following table. An independent-measures t test provided t=2.117 with df=11. convert these data into a form suitable for the point biserial correlation (use 1 for the swimmers and 0 for soccer players) and then computer the correlation
athletes. coded sport. neurological score
swimmers. ______. 10
______. 8
______. 7
______. 9
______. 13
______. 7
______. 6
______. 12
soccer players. ______. 7
______. 4
______. 9
______. 3
______. 7
EX=_____ EY=_____ SSx=_____ SSy=_____
Explanation / Answer
E(X)=mean(X)=sum(X)/n=8/13=0.62
E(Y)=102/13=7.85
SSX=sum(X-E(X))2=3.08
SSY=sum(Y-E(Y))2=95.69
SP=sum((X-E(X))(Y-E(Y))=9.23
correlation=SP/sqrt(SSX*SSY)=9.23/sqrt(3.08*95.69)=0.5376
following information has been generated usin ms-excel
coded sport(X) neruological score (Y) X-E(X) Y-E(Y) (X-E(X))2 (Y-E(Y))2 1 10 0.38 2.15 0.15 4.64 0.83 1 8 0.38 0.15 0.15 0.02 0.06 1 7 0.38 -0.85 0.15 0.72 -0.33 1 9 0.38 1.15 0.15 1.33 0.44 1 13 0.38 5.15 0.15 26.56 1.98 1 7 0.38 -0.85 0.15 0.72 -0.33 1 6 0.38 -1.85 0.15 3.41 -0.71 1 12 0.38 4.15 0.15 17.25 1.60 0 7 -0.62 -0.85 0.38 0.72 0.52 0 4 -0.62 -3.85 0.38 14.79 2.37 0 9 -0.62 1.15 0.38 1.33 -0.71 0 3 -0.62 -4.85 0.38 23.49 2.98 0 7 -0.62 -0.85 0.38 0.72 0.52 sum 8.00 102.00 0.00 0.00 3.08 95.69 9.23 mean= 0.62 7.85 0.00 0.00 0.24 7.36 0.71 n= 13 13 13 13 13 13 13Related Questions
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