Question

experimental investigation

• is used to blank to support or disprove a hypothesis
• involves variables which are controlled and blank to determine their effect
• includes a blank, an independent variable and a dependent blank
• is considered a blank experiment

is fair, is variation, is manipulated, is gather evidence, is control group

Explanation:

1. Experimental investigations are used to gather evidence to support or disprove a hypothesis.
2. Variables in an experiment are controlled and manipulated to determine their effects.
3. Experiments have an independent variable (manipulated) and a dependent variable (observed).
4. A well - designed experiment is considered a fair experiment.

Answer:

1. is gather evidence
2. is manipulated
3. is control group (not a perfect fit but among options, it can be related to the setup with variables; a control group helps in isolating the effect of the independent variable), independent variable, dependent variable
4. is fair