Test 1

Test 2

Test 3

N

Exam Versions

Mean Difficulty Index

S.D

N

Exam Versions

Mean Difficulty Index

S.D

N

Exam Versions

Mean Difficulty Index

S.D

50

Version A

0.69

0.27

50

Version A

0.65

0.24

50

Version A

0.77

0.2

50

Version B

0.721

0.26

50

Version B

0.66

0.25

50

Version B

0.78

0.21

50

Version C

0.69

0.25

50

Version C

0.7

0.23

50

Version C

0.75

0.19

50

Version D

0.68

0.26

50

Version D

0.68

0.2

50

Version D

0.73

0.23