***Public and Private School Principle in the United States: A Statistical Profile, 1987-88 to 1993-94*****Table B3.-Standard errors for Table A3:  Percentage of public school principals by district           size, by sex, race-ethnicity, and age of principals:  1987-88, 1990-91, and           1993-94**------------------------------------------------------------------------------------------------------------------------------------------                                                                                    District size                                     -----------------------------------------------------------------------------------------------------                                          Less than 1,000              1,000-4,999                 5,000-9,999             10,000 or more                                -------------------------  -------------------------  -------------------------  -------------------------Principal characteristics       1987-88  1990-91  1993-94  1987-88  1990-91  1993-94  1987-88  1990-91  1993-94  1987-88  1990-91  1993-94------------------------------------------------------------------------------------------------------------------------------------------     Sex  Male                             1.29     1.50     1.48     1.08     1.15     1.45     1.57     1.78     1.64     1.12     1.13     1.41  Female                           1.29     1.50     1.48     1.08     1.15     1.45     1.57     1.78     1.64     1.12     1.13     1.41Race-ethnicity  American Indian/Alaska Native    0.60     0.53     0.33     0.17     0.14     0.14     0.28     0.26     0.32     0.14     0.19     0.12  Asian/Pacific Islander           0.00       -      0.35     0.08       -      0.01       -      0.45     0.51     0.22     0.26     0.33  Black non-Hispanic               0.27     0.36     0.30     0.34     0.33     0.45     0.98     0.82     1.06     0.89     0.93     1.10  White non-Hispanic               0.81     0.73     0.57     0.38     0.48     0.58     1.14     1.49     1.47     0.89     1.13     1.29  Hispanic                         0.43     0.33     0.30     0.26     0.44     0.39     0.56     1.12     1.14     0.54     0.79     0.89Total minority                     0.81     0.73     0.57     0.38     0.48     0.58     1.14     1.49     1.47     0.89     1.13     1.29Age  Under 35                         0.78     0.90     0.68     0.60     0.54     0.40     0.78     0.58     0.54     0.41     0.28     0.22  35-39                            1.26     1.26     0.94     0.95     0.81     0.69     1.01     1.23     0.93     0.72     0.66     0.49  40-44                            1.64     1.52     1.44     0.92     1.32     1.05     1.61     1.76     1.63     1.01     1.02     0.97  45-49                            1.27     1.33     1.11     0.95     1.10     1.14     1.61     1.84     2.00     1.00     1.08     1.41  50-54                            1.31     1.09     1.34     0.83     0.96     1.11     1.47     1.45     1.45     0.84     0.95     1.04  55 or over                       1.36     1.14     1.44     0.82     0.91     0.89     1.39     1.30     1.65     0.98     0.91     0.96Average age                        0.28     0.30     0.28     0.21     0.20     0.19     0.28     0.25     0.28     0.16     0.17     0.14------------------------------------------------------------------------------------------------------------------------------------------                         - Too few cases for a reliable estimate.SOURCE:  U.S. Department of Education, National Center for Education Statistics, Schools and Staffing Survey:  1987-88 (School   Administrator and Teacher Demand and Shortage Questionnaires), 1990-91 (Public School Administrator and Teacher Demand and Shortage Questionnaires, and 1993-94 (Public School Principal and Teacher Demand and Shortage Questionnaires).