Compare proportions of subjects who consumed less vitamin a

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Reference no: EM13953343

A case-control study was conducted relating to the epidemiology of breast cancer and the possible involvement of dietary fats, along with other vitamins and nutrients. It included 2024 breast cancer cases admitted to Roswell Park Memorial Institute, Erie County, New York, from 1958 to 1965. A control group of 1463 was chosen from patients having no neoplasms and no pathology of gastrointestinal or reproductive systems. The primary factors being investigated were vitamins A and E (measured in international units per month). The data shown in Table E6.15 are for 1500 women over 54 years of age. Test to compare the proportions of subjects who consumed less vitamin A (a150,500 IU/ month), cases versus controls; state clearly your null and alternative hypotheses and choice of test size.

TABLE E6.15

Vitamin A (IU/month) Cases Controls

a150,500 893 392

>150,500 132 83

Total 1025 475

Reference no: EM13953343

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