When researchers study the effect of a particular motivational strategy on problem solving, what important step helps ensure the findings are indeed reliable? Complete a medical exam on all...

When researchers study the effect of a particular motivational strategy on problem solving, what important step helps ensure the findings are indeed reliable?

 Complete a medical exam on all participants

 Establish operational definitions for the variables

Obtain permission from the motivational speakers whose strategies are used in the study

Verify participants have not participated in other research studies

or Confirm that the motivational strategy used has not been studied before