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.
A valid test is a test which measures what itâs supposed to measure. So a valid intelligence test would measure intelligence and not something else like your personality. However, in order to determine the validity of a test, it is necessary to compare the scores obtained by that test with an outside criterion.A valid test tests what it's suppose to test.o a valid intelligence test would measure intelligence and not something else like your personality. However, in order to determine the validity of a test, it is necessary to compare the scores obtained by that test with an outside criterion.