Consider the following: 
The relative price of hamburgers this year has
Definitions:
Confounding Variables
Confounding Variables are external factors in a study or experiment that could influence or distort the relationship between the variables being examined.
Extraneous Variables
Variables that are not the focus of a study but can affect the outcome of research if not properly controlled.
Participants' Reactivity
The alteration of participants' behavior or responses due to the awareness of being observed or studied.
Operational Definition
A clear, precise description of a variable, term, or object in terms of the operations or processes used to observe and measure it.
Q48: Suppose an individual experiences a permanent increase
Q102: Since the 1930s, third-party payments for health
Q143: The CIO was formed as a(n)<br>A) closed
Q201: Suppose that jeans that were fashionable in
Q215: Which of the following best describes the
Q230: Refer to the above figure. The market
Q267: According to the above figure for a
Q277: One reason some economists are critical of
Q368: Refer to the above figure. At a
Q421: Flour is an input used to produce