When extraneous variables influence and distort the relationship ...

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When extraneous variables influence and distort the relationship between the independent variable (IV) and the dependent variable (DV) so that the findings do not reflect a true relationship between the IV and the DV, the result is
 
  a. voided.
  b. inconsistent.
  c. randomization.
  d. bias.

Question 2

A method of sampling in which all subjects in the sample have an equal chance of being assigned to either the treatment group or the control group is
 
  a. between-group design.
  b. within-group design.
  c. random assignment.
  d. random sampling.

[smrtceo]

Answer to Question 1

d. bias.

Answer to Question 2

c. random assignment.