***Public and Private School Principle in the United States: A Statistical Profile, 1987-88 to 1993-94*****Table B20.�Standard errors for Table A20:  Percentage of public and private combined school            principals who view certain issues as serious problems in their schools,            by selected school characteristics:  1993-94**------------------------------------------------------------------------------------------------------------------------------                                                  Five most frequently identified problems in combined schools                                       ---------------------------------------------------------------------------------------                                                      Lack of parent         Student         Students come     Parent alcohol/School characteristics                 Poverty          involvement          apathy       unprepared to learn    drug abuse------------------------------------------------------------------------------------------------------------------------------        PUBLIC  Total                                 1.43               1.96               1.28               1.22               0.90  Minority enrollment    Less than 20%                       1.57               2.15               1.52               1.30               1.08    20% to 50%                          3.41               3.02               2.55               1.78               1.78    More than 50%                       4.09               4.10               3.31               3.42               2.66  School size    Less than 150                       2.55               2.96               2.37               2.30               1.90    150 to 499                          2.25               2.71               1.87               1.67               1.24    500 to 749                          2.72               3.10               3.10               2.44               0.66    750 or more                         3.59               2.56               2.36               2.23               1.19  District size    Less than 1,000                     1.84               2.30               1.66               1.50               1.61    1,000-4,999                         3.42               4.33               2.45               2.35               1.98    5,000-9,999                         4.49               3.00               2.72               3.22               1.64    10,000 or more                      4.01               4.32               3.33               3.24               2.05  Community type    Central city                        3.16               4.53               3.78               3.36               2.15    Urban fringe/large town             3.13               3.27               3.77               1.75               2.06    Rural/small town                    1.61               2.23               1.37               1.29               1.20PRIVATE  Total                                 0.86               0.84               0.97               1.03               0.72  Minority enrollment    Less than 20%                       1.02                 �                1.01               1.17                 �    20% to 50%                          2.26               3.52               2.29               1.40               2.97    More than 50%                       3.31               4.99               3.54               5.00               1.76  School size    Less than 150                       1.22               1.16               1.25               1.54               1.08    150 to 499                          1.28               1.53               1.38                 �                0.00    500 to 749                          0.00               0.00                 �                0.00               0.00    750 or more                         0.00               0.00               0.00               0.00               0.00------------------------------------------------------------------------------------------------------------------------------� Too few cases for a reliable estimate.NOTE:  Problems listed are the five most frequently identified in combined schools, in order of frequency.SOURCE:  U.S. Department of Education, National Center for Education Statistics, Schools and Staffing Survey:  1993-94 (Public School Principal, Public School, and Teacher Demand and Shortage Questionnaires).