Topic 3 Factorial Design

Question 1

Factor?

Answer 1

major independent variable

a. Ex: two factors: amount of instruction and setting

Question 2

Level?

Answer 2

subdivision of a factor

a. Ex: amount of instruction
i. 1hrs vs. 4hrs
b. Setting
i. In class vs. out of class

Question 3

2x2 Designs

Answer 3

1. Number of numbers= number of factors
2. Number of values= number of levels of each
3. Total number of conditions= 2x2=4

Question 4

Interaction effects

Answer 4

1. Combining levels allows us to examine interaction effects
   a. Difference of one factor depends on another factor
2. Between factors, not levels
   a. Ex: time and setting not specific time and settings of level

Question 5

Important features of factorial designs

Answer 5

1. Flexibility for exploring or enhancing the treatment
2. Efficiency- combine studies into one
3. Can examine interaction effects

Question 6

Types of factorial designs:

Within subjects

Answer 6

1. Within-subject- each subject experiences each condition

i. Requires the fewest subjects to achieve power

Question 7

Types of factorial designs

Between Subjects

Answer 7

2. Between- separate groups get each condition
   a. Requires more subjects
   i. Requires the most subjects

Question 8

Types of factorial designs:

Mixed Factorial

Answer 8

3. Mixed- factorial- at least one between and one with subject variable
   a. Gender is commonly used as a between variable
   i. Requires the next fewest… in between both