Question

"To diagnose colorectal cancer, the hemoccult test is conducted to detect occult
blood in the stool. For symptom-free people over 50 years old who participate in
screening using the hemoccult test, the following information is available.
The probability that one of these people has colorectal cancer is 0.3 percent. If a
person has colorectal cancer, the probability is 50 percent that he will have a
positive hemoccult test. If a person does not have colorectal cancer, the
probability is 3 percent that he will still have a positive hemoccult test. Imagine a
person (over age 50, no symptoms) who has a positive hemoccult test in your
screening. What is the probability that this person actually has colorectal
cancer?"

using the above paragraphs

Identify the base rate (or prevalence in medical literature), sensitivity (the
percentage of individuals with a disease who are correctly classified as having the
disease), and false positive rate in this case. Provide a brief and clear description
of these terms using your own words.

Answer 1