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<DIV dir=ltr align=left><SPAN class=731235715-13062011><FONT color=#0000ff
size=2 face=Arial>Assuming that the primary goal is to comparison performance of
the various age groups (and perhaps gender within age group), it can be useful
to think about cell size. If one-year age grouping is proposed, and gender
within age, for 3-7 year olds that would be 10 cells. To estimate means and
variances, a very rough rule of thumb would be about 25-30 subjects per
cell, or 250-300 total. More would be needed if the primary goal was to identify
low-performers, because then you're not just estimating the mean, but values for
extreme cutoffs (lowest 10%, say).</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=731235715-13062011></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=731235715-13062011><FONT color=#0000ff
size=2 face=Arial>But I am absolutely mystified why an ethics committee should
ask you to change the age range of the study. That doesn't seem any of
their business.</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=731235715-13062011></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=731235715-13062011><FONT color=#0000ff
size=2 face=Arial>Philip S. Dale, Professor and Chair</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=731235715-13062011><FONT color=#0000ff
size=2 face=Arial>Speech & Hearing Sciences</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=731235715-13062011><FONT color=#0000ff
size=2 face=Arial>University of New Mexico</FONT> </SPAN></DIV><BR>
<DIV dir=ltr lang=en-us class=OutlookMessageHeader align=left>
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<FONT size=2 face=Tahoma><B>From:</B> info-childes@googlegroups.com
[mailto:info-childes@googlegroups.com] <B>On Behalf Of </B>Vaidyanathan
Raghunathan<BR><B>Sent:</B> Monday, June 13, 2011 7:44 AM<BR><B>To:</B>
info-childes@googlegroups.com<BR><B>Subject:</B> Pragmatics of
interrogtaives<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV>Hi everyone,</DIV>
<DIV> </DIV>
<DIV>One of my Ph.D student, reenctly, has to face a problem before the
ethics committe of the Institution. She is planning to do her research on the
Understanding the pragmatic functions in Tamil Children in then age range of
3-9. She has formulated 25 test questions and has plans to admisnster them to
nearly 180 children But the ethics committee expects her to raduce the range to
3-7 and adminster the test on 450 children.</DIV>
<DIV> </DIV>
<DIV>I personally feel the number is on the higher side and can be reduced. Will
the members be kind enough to give their opinion as to the number of children
needs to be studied to have valid and reliable result of the comprhension of the
pragmatic function of Interrogatives?</DIV>
<DIV> </DIV>
<DIV>Prof. Vaidyanathan</DIV>
<DIV>.</DIV>
<DIV> </DIV>
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