Which of the following threatens the internal validity of an ...

[geodog55]

Which of the following threatens the internal validity of an experiment?
 
  a. using more than one dependent variable
  b. failing to use a representative sample
  c. using an independent variable with more than one level
  d. failing to assign participants randomly to conditions

Question 2

An experimenter finds out that the p-value in his study is 3 in 100. What does this mean?
 
  a. His results have a 3 percent chance of being valid.
  b. He has a 3 percent chance of finding these results by chance alone.
  c. He has a 3 percent chance that his hypothesis is correct.
  d. He has a 30 percent chance that his study had good internal validity.

[nekcihc358]

Answer to Question 1

Answer: D

Answer to Question 2

Answer: B

[geodog55]

TYSM

[kjohnson]

Gracias!