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Example 1.8. Researchers wanted to determine the long-term benefits of the influenza vaccine on seniors aged 65 years and older by looking at records of over 36,000 seniors for 10 years. The seniors were divided into two groups. Group 1 were seniors who chose to get a flu vaccination shot, and group 2 were seniors who chose not to get a flu vaccination shot. After observing the seniors for 10 years, it was determined that seniors who get flu shots are 27% less likely to be hospitalized for pneumonia or influenza and48% less likely to die from pneumonia or influenza.
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