Can vaccination be regarded as a preventive measure for smallpox from the given data:

(i) Of 1482 persons in a locality exposed to smallpox, 368 in all were attacked, and

(ii) Of 1482 persons, 343 had been vaccinated and of these only 35 were attacked.

To determine whether vaccination can be regarded as a preventive measure for smallpox, we analyze the given data using descriptive statistics.

Total persons exposed to smallpox = 1482  
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