Microsoft Excel has some simple capabilities, but it is known to produce inaccurate results in some cases.
Otherwise, Minitab and SPSS are fairly easy to use and are available on IT Services PCs.
SPSS can be download for install on personally owned computer, this FAQ has more information.
Manuals for SPSS can be downloaded from this link:
http://www.sussex.ac.uk/its/help/howtolist
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