The Experimental design Process Research Question (Hypothesis) Design Experiment Collect data Analyze data Draw Conclusions
The Experimental Design Process Research Question (Hypothesis) Design Experiment Collect Data Analyze Data Draw Conclusions
Experimental Design Design of Experiments (doe defined a theory concerning the minimum number of experiments necessary to develop an empirica/model of a research question and a methodology for setting up the necessary experiments a parsimony model Human subject VS object experimentation other doe constraints Time Money
Experimental Design Design of Experiments (DOE) defined: A theory concerning the minimum number of experiments necessary to develop an empirical model of a research question and a methodology for setting up the necessary experiments. A parsimony model Human subject vs. object experimentation Other DOE Constraints Time Money
Experimental Design Basics TWo kinds of data gathering methodologies observation Cant prove cause effect but can establish associations Hawthorne effect social facilitation Experimental Cause effect Variables of interest- factors vs treatments Independent variable Treatment manipulations of variables of interest Treatment VS control group Dependent variable is what you are measuring
Experimental Design Basics Two kinds of data gathering methodologies Observation Can’t prove cause & effect but can establish associations. Hawthorne effect, social facilitation Experimental Cause & effect Variables of interest – factors vs. treatments Independent variable Treatment – manipulations of variables of interest Treatment vs. control group Dependent variable is what you are measuring
More basics Confounds Randomization concerns Randomization prevents experimental bias Assignment by experimenter Counterbalancing Statistical assumptions a requirement for statistical tests of significance Why would you use the observation methodology instead of experiments?
More Basics Confounds Randomization Concerns Randomization prevents experimental bias Assignment by experimenter Counterbalancing Statistical assumptions A requirement for statistical tests of significance Why would you use the observation methodology instead of experiments?
DOE Terminology Replications Independent observations of a single treatment. a Variance The measuring stick that compares different treatments Internal validity The extent to which an experiment accomplishes its goals) Reproducibility Given the appropriate information, the ability of others to replicate the experiment
DOE Terminology Replications Independent observations of a single treatment. Variance The measuring stick that compares different treatments. Internal validity The extent to which an experiment accomplishes its goal(s). Reproducibility Given the appropriate information, the ability of others to replicate the experiment