AQR - unit 3 mid-unit test 2024

Front

What is systematic sampling?

Back

A sampling method where every nth individual is selected from a list or sequence, ensuring a spread across the population.

Front

Define independent variable.

Back

The variable that is manipulated or changed in an experiment to observe its effect on the dependent variable.

Front

What is an observational study?

Back

A research method where the researcher observes and records behavior without manipulating any variables.

Front

Explain single blind control in experiments.

Back

A technique where the participants do not know whether they are receiving the treatment or a placebo, but the researchers do.

Front

What is the null hypothesis (Ho)?

Back

A statement that there is no effect or no difference, used as a starting point for statistical testing.

Front

Define alternative hypothesis (Ha).

Back

A statement that indicates the presence of an effect or a difference, opposing the null hypothesis.

Front

What is the purpose of a placebo in experiments?

Back

To serve as a control to compare the effects of the actual treatment, helping to isolate the treatment's effect.

Front

What is the difference between a dependent variable and an independent variable?

Back

The independent variable is manipulated, while the dependent variable is measured to see how it is affected by the independent variable.

Front

What is cluster sampling?

Back

A sampling method where the population is divided into clusters, and entire clusters are randomly selected for the sample.

Front

Define stratified sampling.

Back

A sampling method where the population is divided into subgroups (strata) and random samples are taken from each stratum.