Observational Studies and Experiment Review

Front

What is a true experiment?

Back

A true experiment is a study that uses random assignment to allocate participants to different groups, allowing for the establishment of causal relationships.

Front

What does 'double blind' mean in an experimental context?

Back

Double blind refers to an experimental procedure where both the participants and the research staff are unaware of who receives the treatment or a placebo, minimizing bias.

Front

What are the two factors in the advertising agency's commercial effectiveness test?

Back

The two factors are length (with 3 levels: 15, 30, and 60 seconds) and format (with 2 levels: animated and live action).

Front

What is the main difference between experiments and observational studies?

Back

An experiment can establish a causal relationship, while an observational study cannot.

Front

What type of study is it when one group receives a treatment and another receives a placebo?

Back

This is an experiment.

Front

Define random assignment.

Back

Random assignment is the process of randomly allocating participants to different groups in an experiment to ensure each group is similar at the start.

Front

What is an observational study?

Back

An observational study is a type of research where the investigator observes subjects without manipulating any variables.

Front

What is a response variable?

Back

A response variable is the outcome that is measured in an experiment to see if it is affected by the treatment.

Front

What is an explanatory variable?

Back

An explanatory variable is a variable that is manipulated in an experiment to observe its effect on the response variable.

Front

What is the purpose of using a placebo in experiments?

Back

A placebo is used to control for the psychological effects of receiving treatment, allowing researchers to isolate the effect of the actual treatment.