document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1162080>Question 1162080</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The mean daily sales for a bookstore were $700 over the last 60 days. The standard deviation of this population is $85. What is the 95% confidence interval? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #785793 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=785793\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> the half-interval for the 95%CI is z*sigma/sqrt(n)=1.96*85/sqrt(60)<BR>\n" );
document.write( "=$21.51. Add to mean and subtract from mean to get CI.<BR>\n" );
document.write( "the CI is ($678.49, $721.51) </SPAN>\n" );
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