document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=750491>Question 750491</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A survey was conducted to determine the percentage of students at a post secondary institution who prefer the new alpha-grading system. The responses from a random sample of 30 students are shown below.<BR>\n" );
document.write( "YES-18, NO-12<BR>\n" );
document.write( "Construct a 98.5% confidence interval for a population proportion who prefer the new alpha-grading system.\r<BR>\n" );
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document.write( "please show all steps. thank you </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #456640 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=456640\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A survey was conducted to determine the percentage of students at a post secondary institution who prefer the new alpha-grading system. The responses from a random sample of 30 students are shown below.<BR>\n" );
document.write( "YES-18, NO-12<BR>\n" );
document.write( "Construct a 98.5% confidence interval for a population proportion who prefer the new alpha-grading system.<BR>\n" );
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document.write( "p-hat = 18/30 = 0.6<BR>\n" );
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document.write( "ME: 2.4324*sqrt(0.6*0.4/30) = 0.2176<BR>\n" );
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document.write( "98.5% CI: 0.6-0.2176 < p < 0.6+0.2176<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. <BR>\n" );
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