The mayor of Pottsville NC is worried about the amount of graffiti that is appearing in the pedestrian tunnels In order to determine a method to help reduce graffiti the mayor surveys ten police officers to get the opinion The police officers say that they should increase the fine After four months of increasing the fine the amount of graffiti has increased Is this study valid or invalid and why O The study is valid the police office sampled those that would be enforcing the law O The study is valid they just need to have more officers on patrol to find those creating the graffiti The study is invalid the mayor did not take a random sample of the town s population to get their thought on the matter The study is invalid It s an opinion that graffiti is not good for the community