1. A factorial experiment allows for estimation of experimental error in two ways. 2. :How do scientists know that this randomness is not merely an experimental error ? 3. I found no psychic phenomena-only wishful thinking, self-deception, experimental error and, occasionally, fraud. 4. Individual residuals are mostly commensurate with experimental error ( about 0.002 in pH ). 5. Thus any experimental error will be present in both axes. 6. From these values, it seems that within experimental error , the universe seems to be flat. 7. No effect greater than the experimental error was observed. 8. Is there some kind of experimental error going on? 9. Other modes of inference, however, may include the heuristically through repeated statistical trials and experimental error . 10. This can cause experimental error when working from photographs in historical studies due to facial expressions.