The main threat(s) to the validity of direct observation is (are) ...

[jon_i]

The main threat(s) to the validity of direct observation is (are)
 
  a. observer effect.
  b. observer bias.
  c. instrumentation.
  d. a and b
  e. a and c

Question 2

The most distinctive characteristic of a situational test is its
 
  a. lifelike atmosphere. c. assumption of prior training.
  b. use of laboratory equipment. d. relatively ambiguous test items.

[rachel]

Answer to Question 1

D

Answer to Question 2

A