The seattle longitudinal study of cognitive development discovered that, among older people, a) their general health has no discernible connection to intellectual ability. b) socioeconomic status has no discernible association with higher levels of intellectual functioning.. c) men tend to retain high levels of cognitive skills longer than women. d) higher socioeconomic status is associated with higher levels of intellectual functioning.

Transplant operations have become routine. one common transplant operation is for kidneys. the most dangerous aspect of the procedure is the possibility that the body may reject the new organ. there are several new drugs available for such circumstances and the earlier the drug is administered, the higher the probability of averting rejection. the new england journal of medicine recently reported the development of a new urine test to detect early warning signs that the body is rejecting a transplanted kidney. however, like most other tests, the new test is not perfect. in fact, 20% of negative tests and 10% of positive tests prove to be incorrect. physicians know that in about 33% of kidney transplants the body tries to reject the organ. if the new test has a positive result (indicating early warning of rejection), what is the probability that the body is attempting to reject the kidney?