In one week, thirty patients were admitted to a large state hospital. A list of the patients classified by sex and by tentative diagnosis follows. For each sex form a frequency distribution by type of diagnosis and display this infor¬

mation via a pair of histograms superimposed on the same graph.

Patient Sex Diagnosis Patient Sex Diagnosis 1 M Senile dementia 16 M Senile dementia 2 F Schizophrenia 17 F Senile dementia 3 M Schizophrenia 18 M Manic-depressive 4 M Manic-depressive 19 F Schizophrenia 5 F Senile dementia 20 M Paretic 6 M Senile dementia 21 F Schizophrenia 7 M Schizophrenia 22 M Schizophrenia 8 F Manic-depressive 23 F Unclassified 9 F Schizophrenia 24 F Schizophrenia 10 F Unclassified 25 F Schizophrenia 11 F Schizophrenia 26 F Unclassified 12 F Senile dementia 27 M Senile dementia 13 M Schizophrenia 28 M Senile dementia 14 M Manic-depressive 29 F Schizophrenia 15 M Schizophrenia 30 M Paretic