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Researchers make a one-sample z interval to estimate the proportion of adults who would say they learned
something new in the past month. Previous studies have suggested that about 40% would answer "yes" to
this question. The researchers plan on using a confidence level of 95%, and they want the margin of error
to be no more than 25%.
If we assume p = 0.40, what is the smallest sample size required to obtain the desired margin of error?
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