The table given below shows the data obtained during the outbreak of smallpox: Test the effectiveness of vaccination in preventing the attack from smallpox. Test your result with the help of x2 at 1 percent level of significance.  Table 1: The table given below shows the data obtained during outbreak of small pox   Attacked Not Attacked Total Vaccinated 31 469 500 Not Vaccinated 185 1315 1500 Total 216 1784 2000

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