Experimental Design. The Research Process Defining a Research Question. Research & the scientific process. What is the scientific process? Rationalism Empiricism. Research is fun. Scientific theories. Inductive theory Specific to general Deductive theory General to specific
The Research Process
Defining a Research Question
Research is fun
e.g., Brown bullheads exposed to PAH-contaminated sediments will develop skin tumors at a higher rate than controls
Determine the levels of independent variables (factors)
and the number of experimental units at each combination of these levels according to the experimental goal.
Experimental unit: the unit we apply the factors on to get the response.
Taste of the drink; score 1 to 10 (from poor to good)
All 2x2x2x2 combinations.
Assign equal number of units to each combination.
(unit: the “null” beverage or say the plain water)
Three available brands; Prices etc.