Examlex
To display the percent of residents at least 65 years old in each of the 50 states in 2011, a good choice of a graph would be a:
Independent Variable
In an experiment, the variable that is changed or controlled to test its effects on the dependent variable.
Control Variable
A variable that is kept constant during a research experiment to ensure that the effect of the independent variable can be measured without interference.
Demand Characteristics
Subtle cues or signals in an experimental setting that influence participants' behaviors or responses, potentially affecting the study's validity.
Placebo
A substance with no therapeutic effect, used as a control in testing new drugs.
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