A sample of nine IT engineers was selected randomly from each of three regions in the United States (Northeast, Southeast, and West). The goal is to test if mean annual salaries for IT engineers are different among the three regions.
The degrees of freedom for the error is
Select one:
a. 24
b. 23
c. 21
d. 3
The degrees of freedom for the treatment is
Select one:
a. 7
b. 3
c. 2
d. 8
What is the alternative hypothesis of interest?
Select one:
a. Average annual salaries in all the three regions are the same
b. Average annual salaries of at least two regions are not the same
What is the factor?
Select one:
a. Mean salaries
b. Region