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Variable
any factor that can have more than one value
constant
factors in an experement that do not change
qualitive data
uses words to describe what is obsereved
control group
contains the same factors as the experimental group, but the independent variable is not changed
independenet variable
is the factor that you want to test, is changed by the investigator to observe how it affects a dependent variable
experimental group
is used to study how a change in the independent variable changes the dependent variable
quantitative data
uses numbers to describe what is observed