Question

What do scientists usually do if they can't draw clear conclusions?

Answer 1

They use the Scientific Method.
The Scientific Method is made up of steps scientists take to draw a conclusion
Step 1: Form a Question
Step 2: Research the Question
Step 3: Form a Hypothesis (educated guess)
Step 4: Conduct an Experiment (use quantitative and qualitative data)
Step 5: Form Your Conclusion Based on Results

This should help....

Answer 2

collect more data to support their hypothesis