Two Ch 4 MC Practice

Front

What is a randomized block experiment?

Back

A randomized block experiment is a study design that divides subjects into blocks based on a certain characteristic, ensuring that each block contains an equal number of subjects for each treatment. This helps control for variability within the blocks.

Front

What is the purpose of a control group in an experiment?

Back

A control group serves as a baseline to compare the effects of the treatment. It helps to isolate the effect of the treatment by ensuring that any changes observed are due to the treatment itself and not other factors.

Front

What does 'double-blind' mean in experimental design?

Back

In a double-blind study, neither the participants nor the researchers know who is receiving the treatment or the placebo. This design helps to prevent bias in the results.

Front

What is the significance of random assignment in experiments?

Back

Random assignment helps ensure that each participant has an equal chance of being assigned to any group, which minimizes pre-existing differences between groups and enhances the validity of the results.

Front

What is a completely randomized comparative experiment?

Back

A completely randomized comparative experiment is a study design where subjects are randomly assigned to different treatment groups without considering any other factors, allowing for a direct comparison of the treatments.

Front

What is the difference between correlation and causation?

Back

Correlation indicates a relationship between two variables, while causation implies that one variable directly affects the other. Correlation does not imply causation.

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. It helps to ensure that any observed effects are due to the treatment itself rather than participants' expectations.

Front

What is the role of blinding in reducing bias?

Back

Blinding reduces bias by preventing participants and researchers from knowing which treatment is being administered, thus minimizing the influence of expectations on the outcomes.

Front

What is an observational study?

Back

An observational study is a type of research where the investigator observes subjects without manipulating any variables. It is used to identify associations but cannot establish causation.

Front

What is the importance of sample size in experiments?

Back

A larger sample size increases the reliability of the results and reduces the margin of error, making it easier to detect true effects of the treatment.