Biostatistics HW help!?

5. A plastic anemia is a condition where the bone marrow does not produce a sufficient quantity of new red blood cells to replenish the old ones. Frickhofen et al performed a study on the effect of using cyclosporine in addition to antilymphocyte globulin and methylprednisolone in the treatment of aplastic anemia patients. A sample of 43 patients receive the cyclosporine in addition to the other treatment. Prior studies have shown that the use of antilymphocyte globulin and methylprednisolone without cyclosporine results in complete or partial remission in 40 percent of patients at the end of 3 months of treatment. The researchers found that 28 patients achieved complete or partial remission at the end of 3 months. Do these data provide evidence that the addition of cyclosporine to antilymphocyte globulin and methylprednisolone improves remission? (Ref: N. Eng. J. Med. 1991 Vol. 324 pp 1297-1304.)