Final answer:
The next step Lili should take in the scientific method after collecting data is to analyze the data.
Step-by-step explanation:
The next step Lili should take in the scientific method after collecting data for her sociological research study on the underground music scene is to analyze the data. Analyzing the data involves tabulating, categorizing, and interpreting the collected data to formulate conclusions. This step is essential in order to determine if the data supports the hypothesis and to discuss the implications of the results.