Two proposed computer mouse designs were compared by recording wrist extension in degrees for 24 people who each used both mouse types. The difference between wrist extension from Mouse B was subtracted from the wrist extension from Mouse A for each participant. The mean difference was found to be 8.82 degrees with a standard deviation of 10 degrees. Assume the sampling of 24 people was adequately random. 1) Is there convincing evidence that the wrist extensions of the two mouse designs is significantly different? U=0 X=8.82, s=10,n=24,df=23 T=8.82/(10/sq root of 24)=4.32 Tcritical=+-2.068 There is convincing evidence that there is a difference in the wrist extension 2) If the standard deviation were actually 26 degrees, would that change your conclusion about the difference between the 2 mouse designs. S=26 8.82/(26/sq root 24)=1.66