An environmental monitoring group randomly sampled water and menhaden from various parts of the Pocomoke River. They counted the percentage of fish that had lesions and the amount of Pfiesteria in different areas of the river.
Their data are summarized in the following table.
 


The group issued a report claiming that their data proved that Pfiesteria was the main cause of fish lesions in the area and disproved Vicki Blazer’s hypothesis. After this report was issued, a number of scientists pointed out that there were serious flaws with the monitoring group's conclusion.

Explain how data like that shown above can lead to inaccurate scientific conclusions. Write your answer in your Answer Book.