The Metro City Bus system is concerned about the number of people who complain about the service. Metro City Bus managers suspect that many people do not know how to complain. Last year, complaints averaged 47.3 per day. Th is year, bus systems manager Ralph Kramden has posted a sign in all buses listing a number to call with complaints. Ralph would like to know whether this effort has generated any additional complaints. He takes a sample of 50 days and finds a mean of 54.7 and a standard deviation of 25.4. What can you tell Ralph?