The optimal difficulty level for items is usually about halfway ...

[magmichele12]

The optimal difficulty level for items is usually about halfway between 100 of the respondents getting the item correct and
 
  a. a 50/50 chance for choosing a correct response.
  b. the level of success expected by chance alone.
  c. the highest possible variance in correct responses for the item set.
  d. zero respondents getting the item correct.

Question 2

Which of the following has served as a major technique of gathering psychological information and provide(s) data that complements test results?
 
  a. The interview
 b. The Rorschach
  c. Test batteries
 d. Standardization

[Sammyo]

Answer to Question 1

b

Answer to Question 2

a