We seek to control extraneous variables in research because they ...

[sammy]

We seek to control extraneous variables in research because they
 
  A) are threats to reliability.
  B) distract the participants.
  C) reduce validity.
  D) reflect the experimenter's planned biases.

Question 2

Changes in one variable resulting in predictable changes in another
 
  A) show that a causal relationship cannot be inferred.
  B) can be observed only in naturalistic or case-study research.
  C) occur only in correlational studies.
  D) suggest that a causal relationship exists.

[Sweetkitty24130]

Answer to Question 1

Answer: C

Answer to Question 2

Answer: D