Quasi-experimental Design

Question 1

What is a quasi-experimental design?

Answer 1

Designs where participants cannot be randomly assigned in

Or

A quasi-experimental design exists whenever casual conclusions cannot be drawn because there is less than complete control over the variables in the study

Question 2

What are the advantages of this design ?

Answer 2

There is increased external validity

Question 3

What are the two types of quasi-experimental designs ?

Answer 3

1. Nonequivalent control group designs
2. Interrupted time series design

Question 4

What is a time series design ?

Answer 4

Designs in which observations are made both before and after an intervention or event

Question 5

What is a interrupted time series design ?

Answer 5

Variation of the basic time series design in which you chart changes in behavior as a function of some naturally occuring event rather than manipulate a independent variable

Question 6

What is a non-equivalent group design

Answer 6

A design that includes a time series component along with a “control group” that is not exposed to the intervention

Question 7

Instead of a control group, quasi-experiments would use a _______

Answer 7

Matched control group

Question 8

What are the threats to internal validity for this design ?

Answer 8

History, maturation, selection bias and regression to the mean

Question 9

What is the advantage and disadvantage of a interrupted time series design ?

Answer 9

A- Allows for evaluation of trends
DA- Often don’t have control group, open to internal validity problems