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MathGroup Archive 2006

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Re: t-test question

  • To: mathgroup at smc.vnet.net
  • Subject: [mg64163] Re: t-test question
  • From: Bill Rowe <readnewsciv at earthlink.net>
  • Date: Fri, 3 Feb 2006 01:03:50 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

On 2/2/06 at 7:09 PM, attila at biking.taiiku.tsukuba.ac.jp (Csukas
Attila) wrote:

>I have found an equation for comparing two means.

>Ue = (na - 1)*Ua + (nb - 1)Ub/na + nb - 2    This is for the pooled
>value of distribution and

>t0 = |xa-xb|/ Root Ue*(1/na+1/nb)   This is for the t value.

This would be done in Mathematica as:

t0= Abs[xa-xb]/Sqrt[Ue (1/na+1/nb)]

>Sample values na=342 nb=170 Ua=6.39 Ub=6.07 xa=177.19 xb=170.37

with these values

In[18]:=Ue = (na - 1)*Ua + (nb - 1)*(Ub/na) + nb - 2
Out[18]=2349.9895029239765

and

In[23]:=t0=Abs[xa-xb]/Sqrt[Ue (1/na+1/nb)]
Out[23]=1.49918
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