Question

a scientific investigation made under controlled conditions to test the validity of a hypothesis is called an

Explanation:

Define the scientific process

Using the Scientific Investigation knowledge point

A controlled test designed to evaluate a hypothesis is defined as an experiment.

Match the definition to the blank

Using the Scientific Investigation knowledge point

The term "experiment" fits the context of a controlled scientific test.

Answer:

A scientific investigation made under controlled conditions to test the validity of a hypothesis is called an <blank>experiment</blank>.