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Chapter 10 Experimental Designs - Coggle Diagram
Chapter 10 Experimental Designs
What is an experiment & When is it used
test an idea to determine whether it influences an outcome/dependent variable
Used to establish cause and effect btw independent and dependent variables
control all variables that influence outcome except IV
used for 2+ groups
Criteria for causal inferences
1 -Causal Relativity
Can compare btwn cause and effect of 2 variables
2 - Causal manipulation
Every particiapnt can be part of control or intervention
3 - Temporal Ordering
Timing: Cause comes first effect second - must have posttest
4 - Elimination of alternative explanations
Asking what else can account for the relationship
Key Experiment Characteristics
Random Assignment/equating the grps
Control over extraneous variables
Covariates
Pretests & postests
Matching participants
Homogenous sampls
Blocking variables
Group comparisons
Outcome measures
Threats to validity*
Manipulation of treatment conditions
via intervention
Types of Experimental Designs
Between group designs
True experiment
Quasi-experiment
Causual-comparative research
Factorial Designs
Within group designs
Time-series experiment
Repeated Measures experiment
Single subject experiment
Ethical issues
withholding treatment from control grp
discontinuance
risks of experiment
Steps in conducting experimental research
1 - Does the experiment address research problem
2- Form hypothesis to test cause & effect relationship
3- Select experimental unit and participants
4 - select treatment and introduce it
6 - conduct experiment
5 - choose type of experimental design
7- Organise and analyze data
8- Develop research report