document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=334646>Question 334646</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A toy manufacturer wants to see how long, on average, a new toy captures 12 children's attention. He tests  children selected at random and finds that their mean attention span is 7 minutes with a standard deviation of  minutes. If we assume that attention spans are normally distributed at 29 minutes, find a 90% confidence interval for the mean attention span of children playing with this new toy. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #240126 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=240126\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A toy manufacturer wants to see how long, on average, a new toy captures 12 children's attention.<BR>\n" );
document.write( "He tests 12 children selected at random and finds that their mean attention span is 7 minutes with a standard deviation of ? minutes. <BR>\n" );
document.write( "If we assume that attention spans are normally distributed at 29 minutes, find a 90% confidence interval for the mean attention span of children playing with this new toy.<BR>\n" );
document.write( "A number is missing from your post.<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( " </SPAN>\n" );
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