With regard to Wells' distinction between system variables and estimator variables, which of the following is not a system variable in eyewitness identification?
A. Eyewitness interviews
B. Police lineups
C. Suspect's race
D. Showups
Question 2
Estimator variables
A. are preventable.
B. involve police procedures.
C. are determined before the police respond.
D. are rarely testified on by psychologists.