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• the respective one-tailed probabilities of —z and +z;
  
• the two-tailed probability of±z;
  
• and the proportion of the normal distribution falling between —z and +z.
  

To proceed, simply enter the value of z in the designated cell and click "Calculate." Note that the programming for this page is able to perform meaningful probability calculations only for cases where |z|<5.

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z =

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Probabilities	P		Text will appear in this box only if the value of |z| is greater than 3.75.
one-tailed for —z
one-tailed for +z
two-tailed for ±z
area between ±z

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   Go to Chapter 7 [Tests of Statistical Significance: Three Overarching Concepts]

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