Table 1.

Performance of teachers and students on the K–4 field tests^a

		Students					Teachers
Test	Items	n	Mean	SD	KR20	Anchor	∆	n	Mean	SD	Core
101	23	349	0.69	0.17	0.74	0.70	0.01	7	0.91	0.16	0.80
102	22	292	0.55	0.17	0.72	0.61	−0.08	4	0.95	0.09	0.95
103	22	165	0.69	0.15	0.66	0.74	0.04	1	0.95	nc	0.95
104	24	218	0.63	0.14	0.61	0.71	0.02	4	0.95	0.02	0.95
105	21	263	0.69	0.17	0.71	0.67	−0.02	5	0.94	0.04	0.94
106	22	368	0.63	0.18	0.75	0.66	−0.03	6	0.97	0.02	0.97
107	22	462	0.63	0.15	0.66	0.68	−0.01	6	0.89	0.06	0.89
108	20	233	0.65	0.17	0.68	0.70	0.01	5	0.95	0.06	0.95
109	22	162	0.60	0.13	0.59	0.70	0.01	2	0.89	0.03	0.89
110	20	327	0.65	0.17	0.69	0.73	0.04	5	0.96	0.02	0.80
111	20	207	0.67	0.16	0.69	0.71	0.02	4	0.95	0.04	0.95
112	19	224	0.62	0.17	0.69	0.66	−0.03	3	0.96	0.06	0.96
113	21	272	0.70	0.15	0.69	0.72	0.03	5	0.95	0.06	0.95
114	20	304	0.62	0.20	0.77	0.66	−0.03	7	0.93	0.06	0.93
115	23	379	0.72	0.14	0.70	0.73	0.04	9	0.97	0.04	0.97
Core	6	4225	0.65	0.17	0.41	0.69	0.00	73	0.94	0.07	0.97

^aThis table summarizes the 15 field tests involving 4225 students of 73 teachers. The student mean scores on each test range from 0.55 to 0.72. The measure of internal consistency, KR20, is 0.59 or higher for each student test. Teachers’ mean scores are much higher than those of students, as expected. Subsample performance based on anchor (core) items allows for a test form difficulty correction (∆) to be calculated. nc = not calculated.