Difference between revisions of "Documentation/SL/How Tos/Calc: funkcija ZTEST"
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[[Category: Documentation/Reference/Calc]] | [[Category: Documentation/Reference/Calc]] | ||
Revision as of 20:23, 4 February 2010
ZTEST
Vrne rezultat z-preizkusa.
Skladnja:
ZTEST(podatki; μ; σ)
- podatki is a range or array containing a random sample from a population (population assumed to have a normal distribution).
- μ je (znana) srednja vrednost populacije.
- σ je znani standardni odklon celotne populacije. Če tega argumenta ni, bo ocenjen iz vzorčnih podatkov z STDEV(podatki).
- ZTEST izračuna z-statistiko:
-
- kjer je m je sample srednja vrednost in n število v vzorcu. Če sta srednja vrednost in standardni odklon populacije znana, z-statistika forms a standard normal distribution - that is, a normal distribution s srednjo vrednostjo=0 in standardnim odklonom=1.
- ZTEST vrne one-sided cumulative probability - the area under the standard normal curve to the right of the z value (shaded blue here):
Example:
ZTEST(A2:A20; 9; 2)
- returns the result of a z-test on a sample A2:A20 drawn from a population with known mean 9 and known standard deviation 2.
Issues:
- Excel has referred to this as both a one-tailed and a two-tailed test. Neither is correct - the test is one-sided as described above. For example when z = -1.5 part of the left tail and all of the right tail are included. This is an unconventional measure, but can be used.
- Calc has produced incorrect results for the 3 parameter version of this function. See issue 90759.
- As with all statistics, a good understanding is needed for reliable results.
