document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1165343>Question 1165343</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A fitness center is interested in finding a 98% confidence interval for the mean number of days per week that Americans who are members of a <BR>\n" );
document.write( "fitness club go to their fitness center. Records of 244 members were looked at and their mean number of visits per week was 3.5 and the <BR>\n" );
document.write( "standard deviation was 1.8.\r<BR>\n" );
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document.write( "I understand a and b, but need help with c.\r<BR>\n" );
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document.write( "a. To compute the confidence interval use a t distribution.\r<BR>\n" );
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document.write( "b. With 98% confidence the population mean number of visits per week is between 3.23 and 3.77 visits.\r<BR>\n" );
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document.write( "c. If many groups of 244 randomly selected members are studied, then a different confidence interval would be produced from each group. <BR>\n" );
document.write( "About ______ percent of these confidence intervals will contain the true population mean number of visits per week and about_________ <BR>\n" );
document.write( " percent will not contain the true population mean number of visits per week.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #789847 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=789847\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> About 98% of the confidence intervals of samples of 244 will contain the true population mean number (the parameter) and about 2% will not contain the true population mean number.  One doesn't know which 98, however, or which 2. </SPAN>\n" );
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