I need to find if a change in 2 values is statistically significant

[Nemesis]

Is there an online calculator I can use?

[Nemesis]

nevermind

[MadTiger]

http://www.statpac.com/surveys/statistical-significance.htm

http://home.ubalt.edu/ntsbarsh/excel/excel.htm

Lower post count would have equal nil for you.
Enjoy.