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.
To have confidence in a measure such as this, we need to test its reliability: the degree to which it is error-free. The type of reliability we'll be examining here is called internal consistency reliability: the degree to which multiple measures of the same thing agree with one another. Benevolent Sexism Scale Peter Glick and Susan Fiske (1996) developed an interesting measure called the Benevolent Sexism Scale (BSS).