A new laboratory test is developed for the diagnosis of rectal cancer.

(a) A sensitivity of 85% implies that 15% of patients with rectal cancer will give negative fi ndings when tested.

(b) A specifi city of 95% implies that 5% of patients with a negative test will actually have rectal cancer.

(c) A positive predictive value of 75% implies that 25% of patients with a positive test will not have rectal cancer.

(d) The sensitivity of the test will depend upon the prevalence of rectal cancer in the population to which it is applied.

(e) The predictive value of the test will depend upon the prevalence of rectal cancer in the population to which it is applied.