Wendy wants to study how easily people make friends. She assigns ...

[nautica902]

Wendy wants to study how easily people make friends. She assigns people to talk with a stranger for either five minutes or ten minutes, and assigns people who are more outgoing to the five-minute condition, and shy people to the ten-minute condition.
 
  Which of the following is the threat to the internal validity in this study?
 
   a. The independent variable isn't held constant for every participant in a condition.
   b. Dependent variables are not being assigned randomly.
   c. She did not select from a random sample in her population.
   d. Wendy did not use random assignment.

Question 2

________ and ________ are the hallmarks of the experimental method, which set it apart from the observational and correlational methods.
 
  a. Random assignment; probability levels
  b. Representative sampling; control over extraneous variables
  c. Control over extraneous variables; random assignment
  d. Correlation coefficients; dependent variables

[komodo7]

Answer to Question 1

Answer: D

Answer to Question 2

Answer: C

[nautica902]

Thank you

[komodo7]

No problem