To evaluate the effectiveness of a new flu vaccine, residents of a small community were given the vaccine free of charge in a two-shot sequence over a period of 2 weeks. Some people received the two-shot sequence, some appeared for only the first shot, and others received neither. A survey of 1000 local residents the following spring provided the information shown in Table 14.6. Do the data present sufficient evidence to indicate that the vaccine was successful in reducing the number of flu cases in the community?

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Table 14.6 2 x 3 Contingency Table No Vaccine One Shot Two Shots Total Flu 24 9 13 46 No Flu 289 100 565 954 Total 313 109 578 1000