The difficulty index of a test item equals the difference in the ...

[Caiter2013]

The difficulty index of a test item equals the difference in the proportions of examinees in the
  upper and lower groups on total test score who get the item right.
 
  Indicate whether the statement is true or false

Question 2

Individual tests are more expensive and require more training to administer than group tests.
 
  Indicate whether the statement is true or false

[nanny]

Answer to Question 1

FALSE

Answer to Question 2

TRUE