Help with chi square tests?
I've only done chi square tests on data in terms of frequency, i.e. how many times does X occur, relative to Y. These seem different, and I'm not quite sure how to set the calculations up. For example, one asks "Is there a significant change in heart rate between rest and exercise?" How do I approach this? Would I need to set some sort of discriminate value, specifying what would constitute a "significant" difference, or do I need to look at how many times heart rate was higher after exercise than it was at rest?