Big Time Software Co. has developed a new version of it XD-3 software. They want to determine if the new version of XD-3 is faster than the old version. In a matched sample test they obtained the following results.

-------Tester----------------OldVersion----------New Version

----------1----------------------3.6------------------2.7

----------2----------------------4.0------------------5.1

----------3----------------------2.8------------------1.9

----------4----------------------1.8------------------1.1

A.) What is the standard deviation for the matched test?

A.	6.31
B.	1.36
C.	1.85
D.	1.17