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Table 2 Descriptive statistics of the examinations

From: Do item-writing flaws reduce examinations psychometric quality?

Year

Phase

Students

Alpha cronbach

Difficulty Index

Mean (SD)

Discrimination

Mean (SD)

Flawed items

N (%)

N

0.62 (0.21)

0.34 (0.16)

446 (55.8)

2008

1

217

0.883

0.57 (0.19)

0.33 (0.14)

71

2008

2

123

0.864

0.63 (0.20)

0.32 (0.17)

59

2009

1

208

0.877

0.66 (0.20)

0.34 (0.14)

59

2009

2

113

0.892

0.65 (0.21)

0.37 (0.16)

56

2010

1

192

0.859

0.65 (0.21)

0.30 (0.14)

60

2010

2

116

0.868

0.59 (0.21)

0.32 (0.15)

54

2011

1

243

0.890

0.62 (0.22)

0.37 (0.17)

45

2011

2

48

0.897

0.59 (0.20)

0.37 (0.19)

42