Variables in Controlled Experiments: Identifying Independent and Dependent Factors

The video tutorial explains the concepts of independent and dependent variables in controlled experiments. It describes how the independent variable is the one that is manipulated, while the dependent variable is the one that is measured. The tutorial provides three examples: study time affecting test grades, aspirin affecting headache relief, and brand affecting light bulb longevity. Each example illustrates the relationship between the independent and dependent variables. The video concludes with a review of these concepts, emphasizing their roles as cause and effect in scientific hypotheses.

What is the role of the independent variable in a controlled experiment?

• It is the variable that is kept constant.

• It is the variable that is manipulated or changed.

• It is the variable that is observed and measured.

• It is the variable that is not used in the experiment.

What is another name for the dependent variable?

• Control variable

• Responding variable

• Manipulated variable

• Constant variable

In the study time example, what is the dependent variable?

• The type of study material used.

• The amount of time students study.

• The test grades of the students.

• The number of students participating.

In the study time example, what is the independent variable?

• The test grades of the students.

• The amount of time students study.

• The number of students participating.

• The type of study material used.

In the aspirin example, what is the independent variable?

• The duration of the headache.

• The severity of the headache.

• The brand of aspirin used.

• Whether or not aspirin is taken.

In the aspirin example, what is the dependent variable?

• The time it takes for the headache to go away.

• The duration of the headache.

• The brand of aspirin used.

• The severity of the headache.

What is being measured in the light bulb example?

• The number of light bulbs used.

• The duration the light bulbs last before burning out.

• The brightness of the light bulbs.

• The cost of the light bulbs.

In the light bulb example, what is the independent variable?

• The number of light bulbs used.

• The brand name of the light bulb.

• The brightness of the light bulb.

• The cost of the light bulb.

Which part of a hypothesis does the independent variable represent?

• The 'and' part.

• The 'if' part.

• The 'because' part.

• The 'then' part.

Which part of a hypothesis does the dependent variable represent?

• The 'then' part.

• The 'because' part.

• The 'if' part.

• The 'and' part.