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Statistisk størrelse med en kjent samplingfordeling. Beregnes for et utvalg og benyttes til å avgjøre utfallet av en statistisk test.

Observator, t* = (p^ - p) / standard error mean.
- T = Z = (Testobservator = punktestimat / standard error mean.
  - Punktestimat=
    - (p^ - p)
    - (snitt-x - u)
  /
  - - (snitt-x -u0)
    - (X-u)
  - Standard error mean=
    - (standardavvik /
  sqrt(populasjon)
  - - rot(n))
    - ROT( (H0 * (1-punktestimat H0))/n )
- Testobservator= (z-verdi)snitt-x - u) / (standardavvik / rot(n))
- Testobservator= snitt-X x -u0 / (sstandardavvik/(rot(n))
- Testobservator=(snitt-x - H0) / (standardavvik / sqrt rot(populasjonn))
- T, testobservatorTestobservator= (X-u) / (Sstandardavvik/ (rot(n)))
- T= t* Testobservator = punktestimat / (utvalgsstandardavvik / rot(n))
Z, testobservator =(Punktestimat-H0) / ROT( (H0 * (1-punktestimat H0))/n )

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