There are 150 students in your school's first year Spanish class. Among the top third of the class, 40 get Item Z correct. Of the bottom third of the class, 20 get item Z correct. What is the discrimination of Item Z?

QUESTION 6 There are 150 students in your school's first year Spanish class. Among the top third of the class, 40 get Item Z correct. Of the bottom third of the class, 20 get item Z correct. What is the discrimination of Item Z? O.27 O .40 O.73 O .60