Can you please explain how to solve this question? The median number of part-time employees at fast-food restaurants in a particular city was known to be 18 last year. City officials think the use of...

Can you please explain how to solve this question?

The median number of part-time employees at fast-food restaurants in a particular city was known to be 18 last year. City officials think the use of part-time employees may be increasing. A sample of nine fast-food restaurants showed that seven restaurants were employing more than 18 part-time employees, one restaurant was employing exactly 18 part-time employees, and one restaurant was employing fewer than 18 part-time employees. Can it be concluded that the median number of part-time employees has increased? Test using alpha=.05 .