A city’s public transportation system claims that it has reduced traffic congestion by 25% over the past year. The data supporting this claim was collected by analyzing traffic flow patterns during peak hours before and after the implementation of several new bus routes.
Some city officials, skeptical of the transportation system's success, argue that the reduction in congestion may be due to the rise in remote work as a result of the pandemic, rather than the new bus routes. To strengthen the argument that the reduction in congestion is indeed due to the bus routes, which of the following would provide the most support?