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Can the investigator establish that the chemical plant and cigarette smoking are the cause for the higher rate of cancer among those in Community A? Can the investigator establish that lower smoking rates and the absence of a chemical factory explains the lower rate of cancer among those in Community B?


A researcher 1lvants te ltnew 1lvhy individuals in Cemrnunity A have a higher rate ef a rare
ferrn ef cancer when cempared te these living in Cemmunity B. Te find eut the reasens fer
the differences in cancer rates in these twe cemmunities. the investigater surveyed
residents aheut their lifestyle. neted the types ef businesses that were present in the
cernmunity and searched medical recerds. The researcher feund that the headquarters fer
the Texice Chemical Plant is Ietated in Cemrnunity A. there is a higher rate ef cigarette
smelting in this temrnunity and residents tended te delay er sltip geing te the decter fer an
annual checkup. In Cemrnunity E, the largest ernpleyer was a department stere and en

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