Hello Adriana:

You could look at this link: http://www.ats.ucla.edu/stat/SPSS/faq/pvalue.html

Kindly

Andrés

Mg. Andrés Burga León
Coordinador de Análisis e Informática
Unidad de Medición de la Calidad Educativa
Ministerio de Educación del Perú
Calle El Comercio s/n (espalda del Museo de la Nación)
Lima 41
Perú
Teléfono 615-5840



"FernandezLanier, Adriana (DCJS)" <Adriana.FernandezLanier@dcjs.state.ny.us>
Enviado por: "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>

13/05/2010 08:24 a.m.
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Asunto
T-Test Question





Good morning. This is probably a basic question but can’t find anything on it. I’m conducting a t-test on my data and want to look at the one-tailed probability. In SPSS, the default is two-tailed. How can I change it two one-tailed? If I’m using 95%, do I split it to 47.5%? Thanks
 
T-TEST PAIRS=preentitle prejust WITH postentitle postjust (PAIRED)
  /CRITERIA=CI(.95)
  /MISSING=ANALYSIS.
 
 
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