Answer: Constructing a hypothesis
Step-by-step explanation:
The hypothesis is a guess backed by reasoning before you start an experiment. It's important to create a hypothesis because you need to reflect on it during the conclusion and when analyzing data to see if you're correct.
An example of a hypothesis would be if you're comparing 4 types of candle sizes and seeing which one will burn all its wax last. Your hypothesis can be I think the 3rd candle will take the longest to burn since it has the largest diameter and is the tallest.
Hope that helped a lot.
:)