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Date:         Thu, 9 Aug 2001 12:42:42 +0000
Reply-To:     Shail Dobson <dobson_shail@HOTMAIL.COM>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Shail Dobson <dobson_shail@HOTMAIL.COM>
Subject:      Re: Why t-test?
Content-Type: text/plain; format=flowed

Yes, we could always use the t-test for comparing means, irrespective of sample size.

>From: David Brown <david_brown123@YAHOO.CA> >Reply-To: David Brown <david_brown123@YAHOO.CA> >To: SPSSX-L@LISTSERV.UGA.EDU >Subject: Why t-test? >Date: Thu, 9 Aug 2001 08:22:50 -0400 > >Hello, > >The t-test is used to test the null hypothesis of no >difference between the means of two independent >samples. The t-test is suitable for small sample >sizes; therefore, the t-distribution is used as the >sampling distribution instead of the normal >distribution. When the degrees of freedom reach 100+, >the t-distribution approaches the normal distribution; >thus, the t-test would act like a z-test. For a sample >size of 30+, the z-test is used. > >My question is why wouldn’t we always use a t-test? > >David > >_______________________________________________________ >Do You Yahoo!? >Get your free @yahoo.ca address at http://mail.yahoo.ca

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