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Experimental Design and Sample Size

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Questions and Answers

What is the primary purpose of correlational research?

To examine the effect of a single independent variable on a dependent variable
To compare the means of two or more groups
To identify naturally occurring relationships between variables (correct)
To establish cause-and-effect relationships between variables

What is the main advantage of within-subjects designs?

They can be used to establish cause-and-effect relationships
They are more cost-effective than between-subjects designs
They control for individual differences between participants (correct)
They allow for the comparison of means between groups

What is the purpose of using a summary measure to assess the fit of a model?

To select the most parsimonious model
To identify the most important predictor variable
To evaluate the degree to which the model explains the data (correct)
To determine the statistical significance of the model

What is the term for the variable being predicted in a regression analysis?

Dependent variable (A) Signup and view all the answers

What is the main difference between laboratory and field research?

Laboratory research has greater control over extraneous variables (C) Signup and view all the answers

What is the term for the difference between the data and the model?

Residual (A) Signup and view all the answers

What is the purpose of counterbalancing in within-subjects designs?

To control for sequencing effects (D) Signup and view all the answers

What is the term for the statistical test used to compare the means of two groups?

t-test (C) Signup and view all the answers

What is the advantage of using a factorial design?

It allows for the examination of interaction effects between independent variables (D) Signup and view all the answers

What is the term for the representation of a multivariate model in matrix form?

Y = Xb + e (C) Signup and view all the answers

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