chi平方测试R和excel

I'm working on independence testing for some stuff at work. I'm usually do this sort of thing in R, but my boss wanted me to do it in Excel for the graphs. My problem is that when I use R's chi squared test, it gives me a different result from the one Excel uses. I'm not sure if I'm setting things up wrong, or if there's a difference in methods used, but the results are pretty much polar opposites. Are the null hypotheses different in these two programs?I'm working on independence testing for some st