Inference

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Article #408

#408

From: Jerry Dallal
Date: Wed, 19 Aug 1992 17:47

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In article <1992Aug18.214711.6657@mailhost.ocs.mq.edu.au>, wskelly@laurel.ocs.mq.edu.au (William Skelly) writes:
> I am not sure I follow you.  From my applications I only want to test
> some null-hypothesis (perhaps a narrow application...but very useful!).
> Generally I want to know if two samples are from the same population.
> Isn't this just asking whether or not the two sample means are close?
> 

Heck, *NO*!!!

Suppose you have two safety devices.  Both are inexpensve to manufacture,
install, and replace, compared to the consequences of their failure.  
One has failure times that follow a
normal distribution with a mean of 10 years and a standard deviation of 1 day.
The other has failure times that follow a
normal distribution with a mean of 10 years and a standard deviation of 
3 years.  I hope you wouldn't be indifferent in choosing a 
device to use when your test of significance fails to reject the null
hypothesis of equal population means.

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<1992Aug14.172833.11844@cbfsb.cb.att.com> <c48nbgtf@csv.warwick.ac.uk> <WVENABLE.92Aug18180002@algona.stats.adelaide.edu.au> <1992Aug18.214711.6657@mailhost.ocs.mq.edu.au>

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Path: arc1-ca.pugleaf.net!sparky!uunet!charon.amdahl.com!pacbell.com!mips!decwrl!bu.edu!jade.tufts.edu!news.tufts.edu!sage.hnrc.tufts.edu!jerry
From: jerry@ginger.hnrc.tufts.edu (Jerry Dallal)
Newsgroups: sci.math.stat
Subject: Inference
Message-ID: <1992Aug19.124712.305@ginger.hnrc.tufts.edu>
Date: 19 Aug 92 17:47:12 GMT
References: <1992Aug14.172833.11844@cbfsb.cb.att.com> <c48nbgtf@csv.warwick.ac.uk> <WVENABLE.92Aug18180002@algona.stats.adelaide.edu.au> <1992Aug18.214711.6657@mailhost.ocs.mq.edu.au>
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