Scientific Method

This variable in an experiment is the one being deliberately changed by the scientist. 

• dependent variable
• independent variable
• data
• control group

A possible explanation to a problem that has not yet been tested. 

• data
• theory
• hypothesis
• fact

The factors in an experiment that can be changed. 

• variables
• quantitative data
• hypothesis
• steps

This part of the experiment serves as a basis of comparison; the one variable being tested has been omitted. 

• experimental group
• control group
• data
• variables

What step does every scientific experiment begin with?

• hypothesis
• question/problem
• procedures
• conclusion

What is a hypothesis?

• A hypothesis is the right answer to an experiment.
• A hypothesis is the wrong answer to an experiment.
• A hypothesis is an educated guess.
• I don't know.

An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this investigation, the independent variable is ...

• The type of plant
• The amount of sunlight
• The type of music
• The type of liquid

The summary at the end of an experiment that explains the results. 

• conclusion
• procedures
• materials
• responding variable

A student wants to test the effects of type of exercise on heart rate.  What is the dependent variable?

• heart rate
• type of exercise
• amount of exercise
• time of day exercise occurs

How many manipulated variables does an experiment have?

• 0
• 1
• between 1 and 5
• as many as needed