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S1.6 - The Design of Experiments
The Design of Experiments
19
Mathematics
Graduate
11/02/2013

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Term
Experiment
Definition
A controlled study conducted to determine the effect of varying one or more explanatory variables or factors has on a response variable
Term
Treatment
Definition
Any combination of the values of the factors
Term
Experimental unit
Definition
In an experiment, is a person, object, or some other well-defined item upon which a treatment is applied
Term
Subject
Definition
An experimental unit that is a person
Term
Control group
Definition
A baseline treatment that can be used to compare to the other treatments
Term
Placebo
Definition
An innocuous medication presented as the experimental medication
Term
Blinding
Definition
Nondisclosure of the treatment an experimental unit is receiving
Term
Single blind
Definition
An experiment in which the experimental unit does not know which treatment he/she is receiving
Term
Double blind
Definition
An experiment in which the neither the experimental unit nor the researcher know which treatment the experimental unit is receiving
Term
Design
Definition
To describe the overall plan in conducting an experiment
Term
6 steps in the process of conducting an experiment
Definition
1. Identify the problem to be solved
2. Determine the factors that affect the response variable
3. Determine the number of experimental units
4. Determine the level of each factor
5. Conduct the experiment
6. Test the claim
Term
Replication
Definition
When each treatment is applied to more than one experimental unit
Term
Inferential statistics
Definition
The process in which generalizations about a population are made on the basis of results obtained from a sample
Term
Completely randomized design
Definition
A design in which each experimental unit is randomly assigned to a treatment
Term
Matched-pairs design
Definition
An experimental design in which the experimental units are paired up
Term
Blocking
Definition
Grouping similar (homogenous) experimental units together and then randomizing the experimental units within each group to a treatment
Term
Block
Definition
Each group of homogenous individuals
Term
Confounding
Definition
When the effect of two factors (explanatory variables) on the response variable cannot be distinguished
Term
Randomized block design
Definition
An experimental design used when the experimental units are divided into homogenous groups called blocks and then randomly assigned to treatments
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