document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1207887>Question 1207887</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 1. For a sample of size 20 taken from a normally distributed population with standard deviation equal to 5, a 90% confidence interval for the population mean would require the use of:<BR>\n" );
document.write( "a. z = 2.58<BR>\n" );
document.write( "b. t = 1.328<BR>\n" );
document.write( "c. z = 1.96<BR>\n" );
document.write( "d. z = 1.645<BR>\n" );
document.write( "e. t = 1.729<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #846276 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=846276\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> this is 1.645 or d.  We know the population sd, so we aren't estimating it from the sample. This uses a z-test and for 90% 1.645 is the value. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );