A superintendent wanted to know if there was a difference among staff retention at elementary,middle, and high schools in her district. Here are the data:

Elementary	Middle	Secondary
27	17	10
25	12	12
30	10	14
17	8	16
14	5	18
20		20
10

What test should she conduct to determine if there is a difference among the levels? What do the results mean? Please write up your results according to the handbook and describe any follow up or additional statistical analysis, if necessary.