I need to choose the correct statistical test to analyze (using SPSS) the results obtained in an experiment as I´m not sure about which would be the correct method. I would really appreciate if someone could give me any advice…
In this case, my variables are a number of different bacteria that have been identified and quanfied for each group in the experiment. In fact, due to the large number of the bacteria identified, I have divided the data in different databases, depending on the phylogenetic level of the detected bacteria.
On the other hand, there were a control group (from which samples were taken at the beginning and at the end of study) and 3 treated groups (with samples taken at the end of treatment). This would be the outline of the experiment. (please find attach)
As observed, the arrows show the comparisons that I´m interested in doing, in the control group (results obtained from the same animals at different time points, at the beginning and at the end of the study) my sample size was of n=5 and in the other groups, the samples size of n=6 (total n=28). Could anyone give me any advice please?
Thank you very much in advance for any help given,