However, there is little valid rationale for doing so, as our two hypothetical people only differed in their absolute scores by two points-and their real-life expressions of this trait are probably indistinguishable. If we imagine a hypothetical personality test scoring Extraversion on a 100-point scale, we might classify someone with a score of 49 as an Introvert, and another individual scoring 51 as an Extravert. Thus, it is somewhat arbitrary to attempt to draw a distinction between Extraverts and Introverts. When measuring levels of Extraversion/Introversion in a population, the distribution of this trait follows a normal curve, with most people being neither particularly Extraverted or Introverted, and a few people showing a clear preference for one style over the other. Unfortunately, all scientific evidence points to this assumption being false. For example, in Myers and Briggs' thinking, a person is either an Extravert or an Introvert. Myers and Briggs felt that personality could be defined in terms of dichotomies, an either-or choice that separates people clearly into one of two camps. Reliability and Validity Problems with the MBTI Assessment
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