A friend who is not familiar with statistics did some research, and plotted a bar chart, with 4 categories on the x-axis and a continuous variable on the y-axis (a variable that varies from 0 to 1, like a ratio). The idea was to show that for one of the categories, the Y variable is higher. Now, he showed the work to his supervisor (I think not a statistician or something), and he told him to add star marks to the bar chart (*), perhaps using the "chi test".
And my question is, if the supervisor known what he is talking about (I am not convinced at all), what does he mean by that ? I need a clue, a direction...
Maybe what your friedn was actually a box-plot (that is how it is called). stars in what? for what? I do not get it either, maybe he meant something else.
chi-test is when both variables are categorical.
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