This is for a PhD experiment I am working on. I have 5 types of rock samples. I am trying to understand how their ability to preserve a type of fossils differs and whether the difference is statistically significant. I determined the presence or absence of the fossil (using a spectroscopy tool) in 9 spots of a defined area in one of the rocks and calculated the percentage of positive fossil occurrences. I then repeated the measurement 10 times in different areas for each category of rock samples. I then obtained a mean percentage of positive occurrences for each category. What test do I use to understand (1) if and (2) how the means of the 5 categories are statistically different from each other? Can I then rank the categories in their preservation potential to contain fossils? Is repeating the test 10 times per category enough?