Topic 16: Confidence Intervals: Proportions
In Elem Stat I, you (should have) explored how sample statistics vary from sample to sample.
You studied this phenomenon empirically through simulations and theoretically with the
CLT. You learned that this vari
Sample Size Determination
The Margin of Error
The width of the interval is determine by the margin of error.
The margin of error, E, in a (1 ) 100% confidence interval in which is known is
given by
E = z
n
where n is the sample size.
Note: We require tha