document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=628652>Question 628652</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Problem 6)<BR>\n" );
document.write( "A government survey conducted to estimate the mean price of houses in a metropolitan area is designed to have a margin of error of $10,000.  Pilot studies suggest that the population standard deviation is $70,000.  Estimate the minimum sample size needed to estimate the population mean with the stated accuracy.  \r<BR>\n" );
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document.write( "Problem 7)<BR>\n" );
document.write( "A researcher wishes to estimate the proportion of college students who cheat on exams.  A poll of 490 college students showed that 33% of them had, or intended to, cheat on examinations.  Find the margin of error for the 95% confidence interval.  <BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #395774 by </B><A HREF=/tutors/aboutme.mpl?userid=John10><B>John10(297)</B></A><img src=\"/images/stars/stars-09.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=John10><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/cgi-bin/show-face.mpl?user=John10><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=395774\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Problem 7)\r<BR>\n" );
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document.write( "A researcher wishes to estimate the proportion of college students who cheat on exams. A poll of 490 college students showed that 33% of them had, or intended to, cheat on examinations. Find the margin of error for the 95% confidence interval.\r<BR>\n" );
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document.write( "We have  p = 0.33  and q = 1- 0.33 = 0.67 , n = 490, the critical value is 1.96 (95% confidence interval)\r<BR>\n" );
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document.write( "standard deviation = sqrt(0.33 * 0.67 * 490) =  10.41\r<BR>\n" );
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document.write( "E = (zs)/sqrt(n)= (1.96 * 10.41)/sqrt(490) = 0.92\r<BR>\n" );
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document.write( "Hope it helps:)\r<BR>\n" );
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document.write( "John10<BR>\n" );
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