THE                      W. J. Youden
                                    NORMAL
                                 LAW OF ERROR
                              STANDS OUT IN THE
                            EXPERIENCE OF MANKIND
                            AS ONE OF THE BROADEST
                          GENERALIZATIONS OF NATURAL
                        PHILOSOPHY * IT SERVES AS THE
                       GUIDING INSTRUMENT IN RESEARCHES
                   IN THE PHYSICAL AND SOCIAL SCIENCES AND
                  IN MEDICINE AGRICULTURE AND ENGINEERING *
            IT IS AN INDENSPENSIBLE TOOL FOR THE ANALYSIS AND THE
   INTERPRETATION OF THE BASIC DATA OBTAINED BY OBSERVATION AND EXPERIMENT