These magma plumes rise to the surface and form chains of volcanoes. Composite volcano magma contains more silica, SiO 2, than that of a shield volcano and is therefore stickier (more viscous). This stickiness plugs up the volcano, causing pressure to build-up. The result is an explosive, dangerous eruption.
It results in a biased sample, a non-random sample of a population (or non-human factors) in which all individuals, or instances, were not equally likely to have been selected. If this is not accounted for, results can be erroneously attributed to the phenomenon under study rather than to the method of sampling.
Example: A bias towards male doctors. 2. (verb) The act of showing a bias. Example: Judging a group negatively because of their ethnicity or not accounting for students with disabilities when designing a test. 3. (verb) To influence in some way. Example: Framing a question on survey to ensure a desired response.