Michael Turner, the local sheriff, suspects that many of his city's residents are operating motor vehicles without current inspection stickers. To determine whether this is true, Michael has his deputies, John, Richard, and Charles, randomly stop 100 cars. Of these 100 cars, 43 do not have current inspection stickers. Michael decides to put some fear into drivers and launches a public relations campaign threatening to crack down. A month later, Michael wants to know whether the program worked. A random sample of 100 cars showed that 21 did not have valid inspection stickers. What can you tell Michael about the program (ask the statistical, research design, and management questions)?

What are the research and null hypothesis? Make a table with the before and. after (proportion, standard deviation, standard error, difference between groups, t, and p-value).