document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=863091>Question 863091</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A study of peach trees showed that average number of peaches per tree was 1500. The standard deviation is 150. A scientist wishes to find the 90% confidence interval for the mean number of peaches per tree. How many trees does she need to sample to be accurate within 14 peaches per tree.\r<BR>\n" );
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document.write( "I understand these types of problems, but I dont get how to find the ones without the sample number like this one. could someone please work through this whole problem so I can understand? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #520193 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=520193\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A study of peach trees showed that average number of peaches per tree was 1500. The standard deviation is 150. A scientist wishes to find the 90% confidence interval for the mean number of peaches per tree. How many trees does she need to sample to be accurate within 14 peaches per tree. \r<BR>\n" );
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document.write( "Since E = zs/sqrt(n)<BR>\n" );
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document.write( "n = [z*s/E]^2<BR>\n" );
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document.write( "Your Problem:<BR>\n" );
document.write( "n = [1.645*150/14]^2 = 311 when rounded up<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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