Thought I had my head around this but have just done some reading and am now not so sure.
So chi squared is said to be an “estimation” and Fishers exact should be used for small numbers (??)
One source I read said “less than 5” (but surely any study with less than 5 is underpowered?). but then the online calculator I use with a 2 x 2 contingency test says “only use Chi-squared if instructed to”
So if I have a sample size of 100 (total sample size – 50 in each group) – should I be using a chi-squared test or a fishers exact? p value comes out very similair but want to know what i am doing is correct
And additional to that – you can use percentages/proportions for chi squared but not fishers exact..correct?