In a recent study, scientists proposed the following hypothesis: "consumption of omega-3 fatty acid can reduce the size of cancerous tumors." the following hypothesis was tested. a sample of 500 rats with tumors was collected. within this sample size, 250 rats were fed with omega-3 (group 1) while the remaining 250 rats were not (group 2). after one month of periodically feeding group 1 with omega-3 fatty acid, rat autopsies were taken for both groups. the average changes of tumor size were measured and recorded. p-value was .04. the average change of tumor size: group 1 = .124g; group 2 = .012g. based on the results from the experiments, which of the following is the best conclusion? a. consumption of omega-3 fatty acid decreases the size of previous cancerous tumors with statistical significance. b. consumption of omega-3 fatty acid has no effect on decreasing the size of previous cancerous tumors. c. absence of omega-3 fatty acid in the diet directly decreases the size of previous cancerous tumors. d. absence of omega-3 fatty acid in the diet decreases the size of previous cancerous tumors with statistical significance. e. consumption of omega-3 fatty acid directly decreases the size of previous cancerous tumors.