IA Analysis - ANOVA or t-test?
If you can plot the data from your investigation in a bar graph of averages, with three or more bars, (like the graph shown) then ANOVA may be a good statistical test for you to use. To compare two means, a t-test works well but it's not good practise to do multiple t-tests, one in twenty will give a "false significant difference" at P<0.05 level of significance. If you have more than two means to test then you...