From: Dick Buck
To: Teacher2Teacher Public Discussion
Subject: Pat's response
Pat wrote: "... must approximate it with the standard deviation of the population, S." I think you meant: the standard deviation of the sample, not the SD of the population. With a good calculator or computer software it is instructive to calculate various confidence intervals, both "t" and "z" for various sample sizes, calculate the MOE for each and show the convergence as the sample size increases.
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