If you're writing a research report based on large amounts of data, do not put raw data in your report. Instead, summarize the data in summary tables, line graphs or bar charts. Which you select depends on your intended readers and their ability to understand your data and read the respective kind of Illustration.
For example, if you are doing a study of radon levels in homes, you need not report the radon level from each home. Instead, you could report the mean, median, or mode from different homes in the different parts of your community.