Example of a $2 imes 2 imes 2$ Factorial Design

When interpreting factorial design notation (e.g., 3 × 2), what does each individual number in the expression represent?

A 2 × 4 factorial design contains more independent variables than a 3 × 3 × 2 factorial design.

Match each psychological study description with its corresponding factorial design notation.

A research team is evaluating several potential study designs. Rank these factorial design notations based on the total number of unique experimental conditions (cells) they create, from the smallest number of conditions to the largest.

A researcher is designing a psychological study to investigate the interaction between three independent variables: Therapy Type (3 levels), Dosage (2 levels), and Patient Age (4 levels). The initial $3 \times 2 \times 4$$ factorial design results in 24 conditions, which exceeds the study budget. You are tasked with creating a revised design that still includes all three independent variables but reduces the total number of experimental conditions to exactly 12. To keep the study as comprehensive as possible while meeting this limit, you decide to reduce the number of levels for exactly two of the variables. Which of the following factorial notations represents your newly created design?

To determine the total number of experimental conditions in a factorial design, a researcher must add the levels of each independent variable together.

A researcher is evaluating two different factorial designs for an experiment. Design A is a $2 \times 2 \times 3$ design, and Design B is a $3 \times 5$ design. Based on the criterion of logistical feasibility (minimizing the total number of experimental conditions), the researcher concludes that Design A is the more practical choice because it requires a total of _____ fewer conditions than Design B.

Match each description of a psychological study's independent variables to its corresponding factorial design notation or logistical feasibility classification.

A researcher is analyzing two proposed studies: Study A uses a $3 \times 4$ factorial design, while Study B uses a $2 \times 2 \times 4$ factorial design. By analyzing the structure of Study B and calculating the product of the levels of its independent variables, the researcher determines that Study B requires a total of _____ experimental conditions.

Evaluate the practical feasibility of the following factorial designs. Order them from most feasible/common in practice to least feasible/uncommon in practice, based on their complexity and the logistical constraints described in the text.