For each of the following pairs of hypotheses, explain what the null hypothesis should be.

(a) Not guilty versus guilty in a court case.

(b) Cage is safe versus cage is unsafe when testing the safety of lion cages.

(c) New drug is safe to use versus new drug is unsafe when determining whether the FDA should allow a new arthritis medicine to be sold.

(d) New treatment is safe versus new treatment is unsafe when determining whether the FDA should allow a new treatment for AIDS to be used.