A chi-sqaure test would be most appropriate for testing which one of the following hypotheses?

That a smaller propoion of poeple who were immunized against chicken pox subsequently develop zoster than those who were not immunized

That the mean blood pressure of black and white male-hypeensive patients taking ACE inhibitors is the same as that of black and white female-hypeensive patients taking ACE inhibitors and that of black and white males and females taking diuretics and placebos

That the mean cost of treating a patient with coronary aery disease with angioplasty isgreater than the mean cost of providing medicaltreatment