Factorial Design Chtp 8

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Define: Main Effect

the effect of one independent variable, averaged over all levels of another independent variable.

A repeated measure design that uses a reverse/block counterbalance consists of?

within- Subject design IV manipulated Manipulated by definition how often tested per conditions less than once

What does a 2x2 Factorial Design tell us?

2 IVs, 4 conditions, 2 level within each IV

2 x 4 repeated measures factorial design with 20 participants in each condition. How many participants?

20 participants

In a 3x4x5 Factorial design: Identify IVs, levels, conditions?

3 IVs 3-4-5 Levels 60 conditions

2 x 2 mixed factorial design with 20 participants in each condition. How many participants?

40 participants

3 x 3 mixed factorial design with 20 participants in each condition. How many participants?

60 participants

2 x 2 independent groups factorial design with 20 participants in each condition. How many participants?

80 participants

Defined: PxE factorial Designs

A factorial design with at least one subject factor (P=person variable) and one manipulated factor (E= environmental variable)

Define: Mixed PxE Factorial Design

A mixed design with at least one subject factor and one manipulated factor that includes a between or within subject variable

Define: Independent group design

Between- subject design IVs manipulated Forms equivalent groups by random assignment

What are the two kinds of results that occur in a Factorial design

Main Effect Interaction

Define: Matched Group design

Manipulated IVs Forms equivalent group by matching Between subject

What type of design involves a mixture of between and within subjects IV in the same experiment?

Mixed Factorial Design

Define: Mixed Factorial Design

Mixed Factorial Design A factorial design with at least one between-subject factor and one within-subjects factor

How can one tell graphically if there is an interaction between two variables?

The dependent variable is plotted as a function of an independent variable, with the other independent variable as a parameter. If the graphical representation of a factorial experiment shows curves that are not parallel, there is an interaction between the variables. If they are parallel, however, there is no interaction. This is true no matter how complicated the curve may be, however small differences may be the result of chance, so statistical evaluation may be necessary.

Define: Factorial Matrix

a row and column arrangement that characterizes a factorial desgins and shows the IVs, the levels of each IVs and the total number of conditions (cells) in the study

Define: Factorial Design

a study with more than one IV

Define: Single-Factor Multilevel Designs

any design with a single independent variable and more than two levels of the independent variable and

Define: ex post facto design

between subject design subject variable groups intrinsically not equal possible matching to increase equivalence

Define: Placebo Control Group

control group in which some ptps believe they are receiving the experimental treatment, but they are not

In a factorial design, Define: condition?

equals the number of cells in a matrix

How is a Factorial designed described, using a standardized notation system?

has a numbering system that simultaneously identifies the number of IVs and the number of levels of each IVs

State the 4 basic design that can be called "single-factor design: two levels"

independent group Matched Group repeated measure group Ex posto factor group

Define: Simple Effect analysis

involves the comparing each of the levels of one factor with each levels of the other factor

A ex post facto design is also known as

non-equivalent group design

Define: Interaction Effect

occurs when the effect of one IV depends on the level of another IV

The term levels in Factorial Design means?

refers to the number of levels of any one IV

In a factorial design, each digits in a standardized notation system represents?

represents an IV and the numerical value of each digit indicates the number of levels


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