I have five groups of students and 40 in each. And we counted the number of references spelling mistakes in their homework. We would like to compare to see if there exists any groups differences in this count dependent variable? What is the best suited test to use? We have a lot of zeros, because students never made any spelling mistake at all.
Groups Count Data Group1 0 Group1 0 Group1 15 Group1 20 …until 40 Group2 1 Group2 0 Group2 0 Group2 25 …until 40 Group3 0 Group3 0 Group3 0 Group3 1 …until 40 Group4 0 Group4 15 Group4 16 Group4 24 …until 40 Group5 0 Group5 1 Group5 1 Group5 16 …until 40
the question is: does the sum of the count of mistakes differ from one group to another? if so, between which groups?
each group actually belongs to a specific language. Let's say, group1 is English, meaning that students are English speaking and submitting their homework in English, and the second group is German, third French , fourth Spanish, and fifth Italian. Students write up some kind of homework and we are interested in knowing which language group students make more mistakes in this particular kind of homework?
actually, it is a special kind of phrasing or special kind of linguistic feature, that I call "mistake", for the sake of explaining clearly. In fact, the more of these, the better! The more the students uses this special kind of "mistake", the better the score! So we want to know if one language is more favourable to the use of this special kind of "mistake". The length of the context in which they appear is not limited, no time, no number of words! It is theoretically endless until the student stops and finishes him/herself. The interviewer doesn't stop the participant. It is possible that in a span of one page, one student includes 30 instances of this kind 'mistake' and another includes only 1 or nothing at all. The students aren't aware of the fact that they are producing such special phrases. We want to test the effect of language on the production of such "mistakes". I hope this is now clear.