An Introduction to Experimental Design: One Factor Analysis
1.1 Basic Concepts of Experimental Design
In many statistical studies a variable of interest, called the response variable (or dependent variable), is identified. Then data are collected that tell us about how one or more factors (or independent variables) influence the variable of interest. If we cannot control the factor(s) being studied, we say that the data obtained are observational. For example, suppose that in order to study how the size of a home relates to the sales price of the home, a real estate agent randomly selects 50 recently sold homes and records the square footages and sales prices of these homes. Because the real estate agent cannot control the sizes of ...
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