The Effect Of Using Concept Map s On Achieving English Grammar ...

According to tables (3) and (4) , the test is proved to be reliable . AlphaCronbach coefficient is (0.912) and the Split- half coefficient is (0.849)3.8 Difficulty coefficientDifficulty coefficient is measured by finding out the percentage of thewrong answers of each item made by the student .Difficulty coefficient ofeach item was calculated according to the following formula :Co of Difficulty =No. of students who gave wrong answerstotal number of the studentX 100The difficulty coefficient varied between (0.31 – 0.69) with a totalmean (0.44), thus all items were acceptable or in the normal limit ofdifficulties according to view of point of assessment and evaluationspecialist. See appendix ( A. 5 )3.9 Discrimination coefficient:The discrimination coefficient was calculated ac cording to the followingformula.No. of the student who has theNo. of the student who has theDiscrimination Coefficient =correctachieversanswer from the high-correct answer from the lowachieversNo. of high achievers studentsNo. of low achievers studentsThe discrimination coefficient varied between (0.30 – 0.70) with atotal mean (0.49), thus all the items are acceptable or in the normal limit of103