EC255 Chapter Notes - Chapter 11: F-Distribution, Type I And Type Ii Errors, Null Hypothesis
Document Summary
Ec255 chapter 11 textbook: analysis of variance and design. Experimental design: a plan and a structure to test hypotheses in which researcher either controls or manipulates one or more variables. Independent variable: either a treatment variable or a classification variable. Treatment variable: variable the experimenter controls or modifies in the experiment. Classification variable: some characteristic of the experimental subject that was present prior to the experiment and is not a result of the experimenter"s manipulations of control. Whether the researcher can manipulate an independent variable depends on the concept being studied. Independent variables like work shift, gender, geographic region, type of machine, and quality of tire are classification variables with conditions that existed prior to study. Researcher can"t change characteristic of variable, so studies phenomenon being explored under several conditions of various aspects of variable. Some independent variables can be manipulated by researcher (e. g. changing amount of light in production areas, size of bonuses, temperature, etc. )
