Example: air traffic controller
Chapter 9. Using Experimental Control to Reduce Extraneous ...

Chapter 9. Using Experimental Control to Reduce Extraneous ...

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to generalize to a given population (increases external validity). However, as we discussed in Chapter 7, it is often difficult to obtain trulyrandom samples, and the researcher often resorts to the use of convenience sampling (such as using introductory psychology students). Thus, the researcher should consider how the

  External, Validity, External validity

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