14.7 A retrospective study of death certificates was aimed at determining whether an association exists between a particular occupation and a certain neoplastic disease. In a certain geographical area over a period of time, some 1500 certificates listed the neoplastic disease as primary cause of death. For each of them, a matched control death certificate was selected, based on age, race, gender, county of residence, and date of death, and stating any cause of death other than the neoplastic disease. The occupation of each decedent was determined. Only one matched pair had both the case and control members in the specified occupation. There were 69 pairs in which the case pair member was in the specified occupation while the control member was not. There were 30 pairs in which the control member was in the occupation and the case pair member was not. In all of the remaining 1400 pairs,

neither the case nor the control member was in the specified occupation.
Test the null hypothesis that the proportion of case and control members in the occupation is the same.