If you knew the population SD (not likely if you are estimating the
population mean), you would have more power with the z statistic (which
requires that you know the population SD rather than estimating it from the
sample) than with t.
-----Original Message-----
If I understand correctly the t test, since it takes into account degrees of
freedom, is applicable whatever the sample size might be, and has no
drawbacks that I could find compared to the z test. Have I misunderstood
something?
Mark
=================================================================
Instructions for joining and leaving this list and remarks about
the problem of INAPPROPRIATE MESSAGES are available at
http://jse.stat.ncsu.edu/
=================================================================
