I'm looking at significant differences for conversion by browser using a chi-squared test. My table looks like this:
Firefox Chrome Safari IE Opera Mini UC Browser Converted 63463 23525 42235 82352 52 12 Not converted 38980 18828 21232 39844 2 4
I know that I shouldn't use chi-squared tests for values below 5.
My question is this: Is it OK to simply ignore the last two columns, and run a chi-squared test on the remaining table?
Or does this in some way invalidate the test?