Quiz on Variables

Which type of variable is manipulated by the researcher in an experimental study?

• Confounding variable

• Dependent variable

• Extraneous variable

• Independent variable

A researcher wants to compare the test scores of students under three different lighting conditions. What is the dependent variable in this study?

• Test scores

• The students

• Lighting condition

• Time of the exam

Which of the following variables is a biological trait that cannot be changed or manipulated by the researcher?

• Test scores

• Blood type

• Temperature

• Weight

What type of variable is characterized by being countable and made up of whole numbers?

• Continuous

• Discrete

• Interval

• Nominal

Which variable is the presumed effect in an experiment?

• Dependent variable

• Confounding variable

• Extraneous variable

• Independent variable

A researcher found that a pet cat walking across a lab table affected the growth of plants in a light exposure study. This is an example of a:

• Dependent variable

• Confounding variable

• Independent variable

• Continuous variable

Which of the following variables is classified as ordinal?

• Type of hair color (e.g., black, brown, blonde, red)

• Email address (e.g., [e-mail], [e-mail])

• Level of agreement (e.g., strongly agree to strongly disagree)

• Area zip code (e.g., 1009, 1010, 1011)

What is a key characteristic of interval variables?

• They have a true zero point

• They are based on ranks

• They have equal intervals but no true zero

• They are based on two categories

Which of the following is a ratio variable?

• Temperature in Celsius

• Time taken to complete a task

• IQ score

• Likert scale rating

What type of variable is “gender”?

• Interval

• Ordinal

• Nominal

• Ratio