Table 2 Range of values and descriptions of the question’s quality measurements

Difficulty index

[0, 0.35)

Very difficult

(Doran 1980)

[0.35, 0.60)

Moderately difficult

(Doran 1980)

[0.60, 0.85)

Moderately easy

(Doran 1980)

[0.85, 1]

Very easy

(Doran 1980)

Discrimination index

[0, 0.3)

Low

(Doran 1980; Ebel 1979)

[0.3, 0.6)

Medium

(Doran 1980; Ebel 1979)

[0.6, 1]

High

(Doran 1980; Ebel 1979)

Reliability (point biserial

[0.0, 0.3)

Low

(Dancey and Reidy 2004)

correlation coefficient)

[0.3, 6.0)

Medium

(Dancey and Reidy 2004)

[0.6, 1]

High

(Dancey and Reidy 2004)