[R] When normality test violate and sample size is large(n=400) can I use t-test

From: Kourosh Ks <kourosh_20084_at_yahoo.com>
Date: Tue, 01 Jun 2010 08:45:49 -0700 (PDT)

 When normality test  violate and sample size is large(n=400) can I use t-test? best gards kourosh

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