The threat to internal validity associated with differences between pre-existing groups when participants are not randomly assigned is
a. history.
b. maturation.
c. statistical regression.
d. selection.
D
You might also like to view...
How is a physician most likely to guard against fetal hypoxia? a. Monitor the fetus's heart rate
b. Avoid exposing the fetus to tainted blood. c. Encourage the mother to deliver vaginally. d. Conduct a genetic screen of the parents.
One of the symptoms of a major depressive episode is decreased or increased appetite
Indicate whether the statement is true or false
Describe the brain structures associated with the valuation of choices.
What will be an ideal response?
Lucas wants to appear confident and powerful during his presentation of the quarterly report. According to research by Carney, Cuddy, and Yap (2010) what should he do when preparing for the talk?
a. stand with his arms crossed over his chest b. stand with his hands firmly planted on the desk c. sit with his legs crossed at the ankle d. stand with his hands behind his back