Within-subjects designs are common in ES research and come w…

Within-subjects designs are common in ES research and come with both pros and cons.  Which of the statements below are true related to within-subjects designs?  Note this is a multiple answer question. At least one answer is correct. More than one response may be correct. Select one or more answers.  

Suppose a researcher interested in measuring body posture in…

Suppose a researcher interested in measuring body posture instructs participants to maintain existing body posture for the week prior to baseline testing and intervention. Further suppose that the researcher observes the participants during this period of time.  Concerns related to research participants subconsciously demonstrating better posture during observation would link most closely to which of the following?