Two random samples were done to determine how often people in a community go to the dentist.
The first sample surveyed 10 people as they entered
their workplaces. The first sample found that the mean
time between visits to the dentist was 7.5 months.
The second sample surveyed 50 people as they entered
the local grocery store. The second sample found that
the mean time between visits to the dentist was 18.1
months.