A psychologist was interested in finding out whether different TV channels lead to a more positive outlook on life. People were split into 5 groups and then taken to a room to view a channel. The five groups saw: ABC, NBC, CBS, CNN, and PBS. After the program, blood samples were taken and serotonin levels were measured as follows:

ABC NBC CBS CNN PBS

11 4 4 7 8

7 8 3 7 6

8 6 2 5 7

14 11 2 4 6

11 9 3 3 5

10 8 6 4 9

9 7 5 3 6

The higher the serotonin level, the happier a person is. Assume 5% level of significance.

Perform F-test (quick-approach). Does happiness depend on TV channel?

Solve this problem in Excel and submit your Excel file.