Answer: The scientists should form a hypothesis and design an experiment.
To form a scientific theory and law, the first step is always to formulate a question based on some observation. The n next step is to formulate a hypothesis and then an experiment is designed. The experiment is conducted and the data is collected and recorded. The, conclusions are drawn and results are communicated.
Hence, the next step after formulation of a question based on an observation, the scientist should form a hypothesis and design an experiment.