Date:         Mon, 11 Apr 2005 13:50:09 -0500
Reply-To:     Shimy Apoorva <sxa6137@BJC.ORG>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Shimy Apoorva <sxa6137@BJC.ORG>
Subject:      appropriate statistical test
Content-Type: text/plain; charset=us-ascii

Hello All,

I have a question. We surveyed our health care workers twice (once in
summer and once in winter) to find out the soap of their choice. Four
soaps from competing companies were used. There were 20 questions
measured on a Likert scale each time. The soaps were assigned scores
based on these questions.

I ran the frequencies and assigned each soap an average score one based
on summer data and one I am working right now on winter data. If i have
to compare the differnces in these scores and I need to find out whether
these scores are significantly different for summer and winter data,
WHICH TEST SHOULD I USE?

Thanks,
Shimy.

>>> "John Norton" <jnorton@lumc.edu> 04/05/05 11:16AM >>>
Hi List,

I've heard the terms "sigma" and "standard deviation" used
interchangeably, but am also aware that in some circles (like in
Quality
control and process engineering) they are not the same.  Can anyone
clarify the differences between the two for me?

Thanks,

John