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the indefinite articles a and an are used when referring to any person or thing. An is used...
goods that are unrelated to each other; the rise in the price of one product will have no effect...
the factor in an investigation that is under the control of the investigator.
a variable that does not depend on another variable for its value (in other words, the variable...
the measurements taken by the researcher. The variable that is not dependent on another variable...