What is the expected number of cases over 1 year in the city? Suppose a city is
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Suppose a city is divided into eight census tracts as shown in Table 4.21.
Table 4.21: Relationship between incidence of birth defects and census tract
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Incidence of birth defects Incidence of birth defects Number of births/yr Number of births/yr Census tract Census tract SES SES High 5000 12,000 10,000 Low Low High Low 100/10° 100/10 50/10° 100/10 100/10 7000 Low 20,000 50/10 100/10 Low Low 5000 H. 100/10 8000 3000 70,000 Total
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