Ch 4 extra Review

Front

What is the purpose of random assignment in experiments?

Back

To create roughly equivalent groups before treatments are administered.

Front

What is a simple random sample?

Back

A sample where every individual has an equal chance of being selected, such as selecting students randomly from a class.

Front

What is the largest population to which survey results can be generalized?

Back

All adult residents of the U.S.

Front

What is confounding in research?

Back

A situation where two variables are mixed together, making it difficult to determine the effect of each.

Front

What is a valid statistical question?

Back

A question that anticipates variability in the data, such as 'How long do students typically wait in line when getting lunch from the cafeteria?'.

Front

What is a population in statistics?

Back

The entire group of individuals or instances about whom we hope to learn.

Front

What is a sample in statistics?

Back

A subset of the population selected for observation and analysis.

Front

What is bias in research?

Back

A systematic error that leads to an incorrect estimate of the effect of a treatment or intervention.

Front

What is a response variable?

Back

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

Front

What is the placebo effect?

Back

A phenomenon where participants experience changes in their condition simply because they believe they are receiving treatment.