document.write( "Question 714903: A social service worker wants to estimate the true proportion of
\n" ); document.write( "pregnant teenagers who miss at least one day of school per week on
\n" ); document.write( "average. The social worker wants to be within 5% of the true
\n" ); document.write( "proportion when using a 90% confidence interval. A previous study
\n" ); document.write( "estimated the population proportion at 0.21.
\n" ); document.write( "(a) Using this previous study as an estimate for p, what sample size
\n" ); document.write( "should be used?
\n" ); document.write( "(b) If the previous study was not available, what estimate for p
\n" ); document.write( "should be used
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Algebra.Com's Answer #439069 by lynnlo(4176)\"\" \"About 
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