3. Experimental design

Question 1

What is a cofounding variable? (Experimental design methods 2)

Answer 1

Variable that may affect the outcome of the experiment that has not been controlled for

Question 2

What is random allocation? (Experimental design methods 2)

Answer 2

Placing participants into groups randomly so difference are not seen due to pre-existing group difference

Question 3

What three types of experiments can you get? (Experimental design methods 2)

Answer 3

True experiments
Quasi experiments
Developmental designs

Question 4

What are the three types of true experiments? (Experimental design methods 2)

Answer 4

Pre-test/control design
Post-test design
Solomons four groups design

Question 5

What is a pre-test control design? (Experimental design methods 2)

Answer 5

Groups are divided into 2 by random allocation
Group A has treatment
Group B does not have treatment
Both groups are measured

Question 6

What is a post-test design? (Experimental design methods 2)

Answer 6

Groups divided into 2 by random allocation
Group A and group B measured
Group A has treatment
Group B does not have treatment
Both groups are measured

Question 7

What is solomons four groups design? (Experimental design methods 2)

Answer 7

Groups divided into 4 by random allocation
Group A is measured, treated, measured
Group B is measured, not treated, measured
Group C has treatment and is measured
Group D has no treatment and is measured

Question 8

What are the 4 types of quasi experiments? (Experimental design methods 2)

Answer 8

Quasi one group post-test
Quasi one group pre-test post-test
Quasi interrupted time series
Non-equivalent control group

Question 9

What is one strength and one limitation of a quasi design? (Experimental design methods 2)

Answer 9

+ High in external validity

- Lack control

Question 10

What is a one-group post test design? (Experimental design methods 2)

Answer 10

Treatment
Measurement

No control group

Question 11

What is a Quasi one group pre-test post-test? (Experimental design methods 2)

Answer 11

Measurement
Treatment
Measurement

Question 12

What is a Quasi interrupted time series design? (Experimental design methods 2)

Answer 12

Measurement
Measurement
Measurement
Treatment
Measurement
Measurement
Measurement

Question 13

What is a Non-equivalent control group design? (Experimental design methods 2)

Answer 13

2 groups that lack random assignment

Question 14

What are the three types of developmental design? (Experimental design methods 2)

Answer 14

Cross sectional research design
Longitudinal design
Sequential design

Question 15

What is cross sectional research design? (Experimental design methods 2)

Answer 15

Collecting all data at one time across different participants in different conditions

Question 16

What is longitudinal design? (Experimental design methods 2)

Answer 16

Collection of data from the same sample of participants in at least two occasions

Question 17

What is sequential design? (Experimental design methods 2)

Answer 17

Select samples from particular conditions, but study them at different times

Question 18

What are inferential statistics useful for? (Experimental design methods 2)

Answer 18

Making inferences on large populations, based on samples

Question 19

What is sample variance? (Experimental design methods 2)

Answer 19

Sample from the same population that have variance