2. A study that evaluated the effects of a reduction in exposure to traffic-related air pollutants compared respiratory symptoms of 295 residents of an area with congested streets with 176 residents in a similar area where the congestion was removed because a bypass was constructed. Assume these residents were randomly selected. The symptoms of the residents of both areas were evaluated at baseline and again one year after the bypass was completed. For the residents of the congested streets, 6% reported their symptoms of wheezing improved. For the residents of the non-congested area (bypass), 21% reported their symptoms improved. Find and interpret an appropriate estimate for the additional likelihood of showing improvement in respiratory symptoms as a result of having a bypass for traffic