Question: Select the statement that expresses an approach used with experiments. a.) The researcher should have control over exactly one variable. b.) The researcher should have

Select the statement that expresses an approach used with experiments.

  • a.)
  • The researcher should have control over exactly one variable.
  • b.)
  • The researcher should have control over all of the variables.
  • c.)
  • The researcher should not have control over any variable.
  • d.)
  • The researcher should have control over some of the variables.

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