document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=965061>Question 965061</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A sample of 62 night-school students' ages is obtained in order to estimate the mean age of night-school students. x = 25.1 years. The population variance is 26.\r<BR>\n" );
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document.write( "(a) Give a point estimate for &#956;. (Give your answer correct to one decimal place.)<BR>\n" );
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document.write( "Correct: Your answer is correct.<BR>\n" );
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document.write( "(b) Find the 95% confidence interval for &#956;. (Give your answer correct to two decimal places.)<BR>\n" );
document.write( "Lower Limit	 <BR>\n" );
document.write( "Upper Limit	 \r<BR>\n" );
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document.write( "(c) Find the 99% confidence interval for &#956;. (Give your answer correct to two decimal places.)<BR>\n" );
document.write( "Lower Limit	 <BR>\n" );
document.write( "Upper Limit	 \r<BR>\n" );
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document.write( "I got part a) correct.  And I know I have to deduct in either direction from the mean to find the limits (I think).  But I am not sure how to figure out what to deduct.  I have looked online and can't seem to find anything similar with clear cut, step by step instructions. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #589847 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=589847\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A sample of 62 night-school students' ages is obtained in order to estimate the mean age of night-school students. x-bar = 25.1 years. The population variance is 26.<BR>\n" );
document.write( " (a) Give a point estimate for &#956;. (Give your answer correct to one decimal place.)<BR>\n" );
document.write( "Ans: 25.1<BR>\n" );
document.write( " Correct: Your answer is correct.\r<BR>\n" );
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document.write( " (b) Find the 95% confidence interval for &#956;. (Give your answer correct to two decimal places.)<BR>\n" );
document.write( "Margin of Error = z*s/sqrt(n) = 1.96*26/sqrt(62) = 6.47<BR>\n" );
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document.write( "Lower Limit = x-bar - ME = 25.1-6.47 = 18.63<BR>\n" );
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document.write( "Upper Limit = x-bar + ME = 25.1+6.47 = 31.57<BR>\n" );
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document.write( "(c) Find the 99% confidence interval for &#956;. (Give your answer correct to two decimal places.)<BR>\n" );
document.write( "ME = 2.5758*26/sqrt(62) = 8.51<BR>\n" );
document.write( "Lower Limit = 25.1-8.51 <BR>\n" );
document.write( "Upper Limit = 25.1+8.51 <BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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