Answer
Step 1. Read and explore the data.
Step 2. Observe differences in the data and ask what might have caused these differences.
Step 3. Perform an analysis and write the story that the data tell.
Work Step by Step
Step 1. Read and explore the data. Calculate values from it. Create charts and graphs.
Step 2. Observe differences in the data and ask what might have caused these differences. Consider if these differences are what might be expected, or if they might be significantly different from each other. Use an appropriate hypothesis test, if applicable.
Step 3. Perform an analysis and write the story that the data tells.