To what extent does gender influence length of hospital stay for MI patients?

There is a hypothesis test associated with your test/technique (even if you are not doing a t-test). What is your null hypothesis and what is your alternative hypothesis? (This should be specific to the test/technique you chose, and it should involve at least one parameter. For example, "H₀: gender does not influence length of stay for MI patients" is NOT specific to any statistical technique and should NOT be used here.)