The hypothesis in a scientific investigation is

In an experiment, there should be only one _________. Everything else should be a ________.

Cause is to effect as _____ is to _____

Which is the first step in the scientific method?

The independent variable is also called the

Which variable is affected by the independent variable?

A farmer applies different fertilizer to his plants to see which will make the plants grow the highest. What is the independent variable?

A farmer applies different fertilizer to his plants to see which will make the plants grow the highest. What is the dependent variable?

In a study about headaches, doctors gave patients Aleve, Tylenol, and Advil to see which medication would relieve the headache pain the fastest. The doctors timed how long it took the medication to work. What is the Independent variable?

In a study about headaches, doctors gave patients Aleve, Tylenol, and Advil to see which medication would relieve the headache pain the fastest. The doctors timed how long it took the medication to work. What is the Dependent variable?

The independent variable is the variable that you change.

The dependent variable is the one you measure.

How many independent variables can you have in an experiment so that your investigation is valid?

The variables or factors in an experiment that must stay the same.

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