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

From: Robert A LaBudde <ral_at_lcfltd.com>
Date: Tue, 01 Jun 2010 16:43:12 -0400

At 11:45 AM 6/1/2010, Kourosh Ks wrote:
>Dears
> When normality test violate and sample size is large(n=400) can I
> use t-test?
>best gards kourosh

Generally "yes", unless there is something really pathological about the distribution.

You should note that, for n = 400, even the simplest distribution-free tests should have near perfect power, so which test you use is not important.



Robert A. LaBudde, PhD, PAS, Dpl. ACAFS e-mail: ral_at_lcfltd.com
Least Cost Formulations, Ltd.            URL: http://lcfltd.com/
824 Timberlake Drive                     Tel: 757-467-0954
Virginia Beach, VA 23464-3239            Fax: 757-467-2947

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