document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=324295>Question 324295</A>: <I><SPAN STYLE=\"word-break: break-all;\"> use formulat: sample mean+ margin of error...margin of error=z o/sqrtn<BR>\n" );
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document.write( "a manager of a baseball satdium wished to construct a 90% confidence interval for the average age of all baseball fans. in a random sample of 40 fans the mean age was 32.5 wiht a standard deviation of 2.3 years. construct an internval. why would the mananger fin this informatio useful?\r<BR>\n" );
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document.write( "i cam up with the margin error of .60....is that all i need to do for this problem or do i do the phat+.60 and phat-.60...or am i adding many extra steps that aren't necessary.....help please 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 #232110 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=232110\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a manager of a baseball satdium wished to construct a 90% confidence interval for the average age of all baseball fans. in a random sample of 40 fans the mean age was 32.5 wiht a standard deviation of 2.3 years. construct an internval. why would the mananger fin this informatio useful? <BR>\n" );
document.write( "i cam up with the margin error of .60....is that all i need to do for this problem or do i do the phat+.60 and phat-.60...or am i adding many extra steps that aren't necessary<BR>\n" );
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document.write( "For this confidence interval you need:<BR>\n" );
document.write( "x-bar = 32.5<BR>\n" );
document.write( "and<BR>\n" );
document.write( "margin of error = 1.6849*2.3/sqrt(40) = 0.6127<BR>\n" );
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document.write( "Then construct xbar-ME < u < xbar+ME<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
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