Types of Experimental Designs (Educational research) True Experimental Quasi-Experimental.

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Presentation transcript:

Types of Experimental Designs (Educational research) True Experimental Quasi-Experimental

Types of Experimental Designs Simple True Experimental Quasi-Experimental

Types Randomized posttest control group design Randomized pretest-posttest control group design

Randomized posttest control group design RTPost RCPost

Randomized pretest-posttest control group design RPreTPost RPreCPost Makes it possible to ascertain that groups were equivalent at the beginning of the study. Not necessary if: 1. Randomization was used 2. Large sample size

Solomon four-group design RPreTPost RPreCPost RTPost RCPost Four groups are formed by random assignment ( R ) of participants, two groups are pretested ( O ) and two are not, one pretested and one unpretested group receive the experimental treatments ( X1, X2 ), each group is administered a posttest on the dependent variable, and posttest scores are compared to determine effectiveness of treatments

Types of Experimental Designs Simple True Experimental Quasi-Experimental

Characteristics of True Designs Manipulation (treatment) Randomization Control group Less control More real-world Program evaluation

Quasi-experimental Designs One group posttest-only design One group pretest-posttest design Non-equivalent control group design Non-equivalent control group pretest- posttest design Time series

Quasi-experimental Designs One group posttest-only design One group pretest-posttest design Non-equivalent control group design Non-equivalent control group pretest- posttest design Time series

Randomized posttest control only design RTPost RCPost

One group posttest-only design (One shot study) TPost No control of IV threats Use?

Quasi-experimental Designs One shot study One group pretest-posttest design Non-equivalent control group design Non-equivalent control group pretest- posttest design Time series

Randomized pretest-posttest control group design RPreTPost RPreCPost

One group pretest-posttest design PreTPost History Maturation Testing Instrumentation Regression Use control group

Quasi-experimental Designs One shot study One group pretest-posttest design Non-equivalent control group design Non-equivalent control group pretest- posttest design Time series

Randomized posttest control group design RTPost RCPost

Non-equivalent control group design (Static group comparison design) TPost CPost Selection bias

Quasi-experimental Designs One shot study One group pretest-posttest design Non-equivalent control group design Non-equivalent control group pretest- posttest design Time series

Randomized pretest-posttest control group design RPreTPost RPreCPost

Non-equivalent control group pretest-posttest design PreTPost PreCPost Can check selection bias

Quasi-experimental Designs One shot study One group pretest-posttest design Non-equivalent control group design Non-equivalent control group pretest- posttest design Time series

Pre Pre Pre Pre T Post Post Post Post …a single group is pretested ( O ) repeatedly until pretest scores are stable, exposed to a treatment ( X ) and, then, is repeatedly posttested ( O )