the local department of transportation is responsible for maintaining lane lane edge line on its paved road. there are two new paint products on the market. sixty comparable stretches of road are identified. paint A randomly assigned to 30 stretches of road and paint B is assigned to the other 30. the department of transportation finds that paint B lasts significantly longer than paint A.
what is the subjects of this experiment?
treatment and response variables?
identify confounding variables?
The subjects of this experiment are the 60 comparable stretches
of road which have been identified and on which two new paint
products will be applied.
The treatment variable is the paint variety and here we have two
levels of this variable - paint A and paint B. The response
variable is the period of time a variety of paint lasts on a
specific stretch of road.
The confounding variable refers to those persons who randomly
assigns a particular paint to a particular stretch of road, thereby
influencing both the dependent and the independent variable.
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