Table 2: Item difficulties, discriminations, and betas.

ItemDifficultySDDiscriminationBeta

A1a0.8800.3260.3980.087
A20.9180.2750.5200.047
A30.8090.3940.5040.116
A40.9240.2670.5100.049
A50.9400.2380.4990.032
A60.9670.1790.1630.012
A70.8740.3320.5490.025
A80.8800.3260.4440.058
A90.8580.3500.3860.085
A100.8800.3260.5620.026
A110.9020.2990.4720.063
A120.9510.2170.4440.060
A130.9020.2990.4170.052
A140.8630.3440.3950.062
A150.8420.3660.3910.073
B160.9340.2480.3960.054
B170.9240.2670.4730.044
B180.9510.2170.4310.058
B190.6450.4800.3930.094
B200.9020.2990.3900.057
B210.7210.4500.5040.115
B220.8360.3710.4270.044
B230.9340.2480.3690.036
B240.6340.4830.3610.170
B250.8090.3940.4640.071
B260.8090.3940.4510.099
B270.8630.3440.6010.082
B280.9130.2830.4700.051
B290.8200.3860.5430.034
B300.7540.4320.6600.109
B310.7980.4030.5200.072
B320.8140.3900.5200.118
B330.8690.3390.5260.054
B340.4260.4960.3940.151
B350.8740.3320.6660.062
B360.8630.3440.6410.052
C370.8630.3440.5700.079
C380.7430.4380.7070.031
C390.5790.4950.5120.091
C400.5790.4950.5220.146
C410.4480.4990.5290.050
C420.7100.4550.6270.051
C430.6280.4850.6330.100
C440.6780.4690.6300.074
C450.2510.4350.3460.183
C460.4810.5010.6210.110
C470.1970.3990.2440.074
C480.5190.5010.5350.048
C490.5680.4970.5640.090
C500.6280.4850.6940.070

Letter prefixes before items numbers denote from which of the three test paragraphs the item is drawn.