Jiminy cricket, what a unique project!
How have you defined 'dirtiness'? Is there an established measurement device or definition?
I'm not sure that your research question is all that conducive to inferential statistics - what proportion of overall dirtiness would cigarette butts need to comprise to be the 'main' reason, after all? :O





. Anyway after we collected a data , we would like to see how far can we go with tests. I mean which test to use (except Hypothesis testing). What else could we also prove with these data?
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