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J Accid Emerg Med 17:409-415 doi:10.1136/emj.17.6.409
  • An introduction to statistics

Article 4. An introduction to estimation—1. Starting from Z

Table 4

Answer to table 1 : practising with z statistics

Element value Population mean Population standard deviation z statistic Area under the curve to the right of the z statistic
8.0 12.0 2.0 −2.0 0.4772 + 0.5 = 0.9772
6.0 12.0 2.0 −3.0 0.4987 + 0.5 = 0.9987
16.0 14.0 4.0 0.5 0.5 − 0.1915 = 0.3085
20.0 14.0 4.0 1.5 0.5 − 0.4332 = 0.0668

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