Understanding Variables in Experiments

The video tutorial explains the concepts of independent and dependent variables in controlled experiments. It describes how the independent variable is manipulated to observe its effect on the dependent variable. The tutorial provides examples, such as study time affecting test grades, aspirin affecting headache relief, and light bulb brand affecting longevity, to illustrate these concepts. The video concludes with a review of the roles of these variables in forming hypotheses.

What is a controlled experiment?

• An experiment where all conditions are changed

• An experiment where all variables are changed

• An experiment where all conditions are kept constant except one

• An experiment with no variables

What is another name for the independent variable?

• Manipulated variable

• Measured variable

• Responding variable

• Constant variable

Which variable is often abbreviated as IV?

• Controlled variable

• Independent variable

• Dependent variable

• Responding variable

What does the dependent variable represent in an experiment?

• The variable that is observed and measured

• The variable that is ignored

• The variable that is kept constant

• The variable that is changed

Which variable is often abbreviated as DV?

• Manipulated variable

• Controlled variable

• Dependent variable

• Independent variable

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

• Type of test

• Number of students

• Study time

• Test grades

In the aspirin example, what is the dependent variable?

• Whether aspirin is taken

• The type of headache

• The speed of headache relief

• The dosage of aspirin

In the light bulb example, what is being measured?

• The cost of the light bulb

• The brand of the light bulb

• The color of the light

• The hours the light bulb lasts

What part of the hypothesis does the independent variable represent?

• The conclusion part

• The effect part

• The cause part

• The then part

What part of the hypothesis does the dependent variable represent?

• The if part

• The cause part

• The introduction part

• The effect part