document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1182574>Question 1182574</A>: <I><SPAN STYLE=\"word-break: break-all;\"> write the word or phrase that best completes each statement or answers the question\r<BR>\n" );
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document.write( "A manufacturer claims that the mean lifetime of its fluorescent bulbs is 1000 hours. A homeowner selects 40 bulbs and finds the mean lifetime to be 990 hours with a population standard deviation of 80 hours. Test the manufacturer's claim. Use α = 0.05. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #812684 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=812684\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Ho: mu=1000 hours<BR>\n" );
document.write( "Ha: mu NE 1000 hours<BR>\n" );
document.write( "alpha=0.05 P{reject Ho|Ho true}<BR>\n" );
document.write( "test is a z.<BR>\n" );
document.write( "critical value is |z| >1.96<BR>\n" );
document.write( "calculation z=(990-1000)/80/sqrt(40)<BR>\n" );
document.write( "=-10*sqrt(40)/80<BR>\n" );
document.write( "=-0.79 <BR>\n" );
document.write( "fail to rect Ho, The mean lifetime can be 1000 hours; insufficient evidence to state otherwise.<BR>\n" );
document.write( "p-value=0.43 </SPAN>\n" );
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