The hormone levels (measured in ng/dL as a decimal number) of medical doctors is compared to those of teachers in a test.

What statistical test would you use to check if there is a difference between the professions?

What are the b) null and c) alternative hypotheses?

What would be d) Type I and e) Type II errors?

In another test, the researchers compared the levels between three groups: i) unemployed, ii) employed without university degree and iii) employed with university degree. Which statistical test should be used in this case?