Exploring Variables in Controlled Experiments

The video tutorial explains the concepts of independent and dependent variables in controlled experiments. It defines the independent variable as the one being tested or manipulated, while the dependent variable is the one being observed or measured. The tutorial provides examples to illustrate these concepts: study time affecting test grades, aspirin affecting headache relief, and brand name affecting light bulb longevity. The video concludes with a review, emphasizing the independent variable as the cause and the dependent variable as the effect in an experiment.

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 unaffected by the experiment.

In the context of a controlled experiment, what does the dependent variable represent?

• The variable that is manipulated.

• The variable that is kept constant.

• The variable that is observed and measured.

• The variable that is unaffected by the experiment.

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

• The difficulty of the test.

• The number of students participating.

• The amount of time students study.

• The test grades of students.

What is the dependent variable in the study time example?

• The subject of the test.

• The time of day students study.

• The test grades of students.

• The number of students who study.

In the aspirin example, what is the independent variable?

• The type of headache.

• The amount of aspirin taken.

• Whether or not aspirin is taken.

• The duration of the headache.

What is the dependent variable in the aspirin example?

• The type of headache.

• The speed of headache relief.

• The severity of the headache.

• The amount of aspirin taken.

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

• The cost of the light bulb.

• The color of the light bulb.

• The brand of the light bulb.

• The brightness of the light bulb.

What is the dependent variable in the light bulb example?

• The cost of the light bulb.

• The duration the light bulb lasts.

• The brand of the light bulb.

• The brightness of the light bulb.

Which part of a hypothesis does the independent variable represent?

• The 'because' part.

• The 'then' part.

• The 'if' part.

• The 'and' part.

Which part of a hypothesis does the dependent variable represent?

• The 'because' part.

• The 'then' part.

• The 'and' part.

• The 'if' part.