A local bus company announced a change to a large number of regular bus routes that serve low-income areas where a large percentage of the residents are dependent on public transit to get around on a daily basis. The bus company management claimed that the purpose of the changes was to create a new “transit corridor” that will better serve the residents. A group of local residents is protesting the changes, claiming that they were instead designed to kill local businesses along the existing routes and benefit developers of new apartment buildings and a shopping center planned along the proposed new routes. Both the management and residents refer to conflicting results from competing surveys of area residents that support their respective positions. What validity tests could be done on these measurement devices?