Research Methods Final Quasi-Experiment

Front 1

Definition of quasi-experiments

Back 1

-resemble procedures of true experiments

Front 2

Characteristics of quasi-experiments

Back 2

-have a type of intervention or treatment and provide comparison
-lack control
-lack of randomization

Front 3

Internal validity and quasi-experiments

Back 3

-Due to lack of internal validity researchers must seek additional evidence to counter-balance threats
-Researchers must approximate conditions of a true experiment

Front 4

Intact Group

Back 4

testing groups not individuals

Front 5

O1 X O2

Back 5

- O1 = pretest of group
- O2 = post test
- X = treatment or intervention

Front 6

Problem with pretest -> treatment or intervention -> posttest

Back 6

results on post-test could come from anywhere not necessarily from treatment (history, maturation, testing, or instrumental threats)

Front 7

Types of Quasi-Experiments

Back 7

- Non-equivalent control groups design
- Interrupted Time-Series
- Time Series with Nonequivalent Control Group

Front 8

Nonequivalent control group design

Back 8

-Treatment and comparison group are compared using pre and posttest measures
-If pretest scores similar between two groups and then alter at posttest can be easier to draw conclusion treatment effective
-Threats to internal validity easier to control
-Need two conditions to use: (1) There is a similar control group and (2) there is an opportunity to collect pre and posttest data

Front 9

Interrupted Time Series

Back 9

- Researchers examine a series of observations both before and after treatment
-Evidence for treatment effect occurs when there are abrupt changes in time-series data at time treatment was given
-Major threats: history and changes in measurement

Front 10

Time Series with Nonequivalent Control Group

Back 10

- OOOOOOOO X OOOOOOOO
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