Seventh, because the immune system is weak it cannot kill enough cancer cells and the cancer cells grow out of control. Thus, in summary, the root cause of cancer is microbes and parasites that are in the organs or colon (or bloodstream), which weakens the immune system. However, other things can cause cancer.
Test Reliability and Validity Defined Reliability. Test reliablility refers to the degree to which a test is consistent and stable in measuring what it is intended to measure. Most simply put, a test is reliable if it is consistent within itself and across time.
How do you Determine if a Test has Validity, Reliability, Fairness,and Legal Defensibility? 1Professional Testing Inc.Â© PTI 2006 1. Validity Validity is arguably the most important criteria for the quality of a test. The term validityrefers to whether or not the test measures what it claims to measure. On a test with highvalidity the items will be closely linked to the test's intended focus. For many certificationand licensure tests this means that the items will be highly related to a specific job oroccupation. If a test has poor validity then it does not measure the job-related contentand competencies it ought to.