document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1192844>Question 1192844</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Ocho Rios Autoworks, a chain of automotive tune-up shops, advertises that its personnel can change oil, replace the oil filter, and lubricate any standard automobile in 15minutes, on the average. The Bureau of Standards received complaints from customers that service<BR>\n" );
document.write( "takes considerably longer. To check the firm's claim, the Bureau had service done on 21 unmarked cars. The mean service time was 17 minutes, and the standard deviation of the  sample was 1 minute. Use the 0.05 level of significance to check the reasonableness of the         <BR>\n" );
document.write( " claim made by Ocho Rios Autoworks.\r<BR>\n" );
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document.write( "Z = (X  -  U) / (SD / √n)<BR>\n" );
document.write( "=17-15/1/sqrt(21)<BR>\n" );
document.write( "= 9.165<BR>\n" );
document.write( "I have never gotten a z value so large before, please adbise if I am doing something wrong\r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #824766 by </B><A HREF=/tutors/aboutme.mpl?userid=ikleyn><B>ikleyn(52787)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ikleyn><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=ikleyn><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=824766\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> .\r<BR>\n" );
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document.write( "Duplicate.\r<BR>\n" );
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document.write( "Just answered under this link\r<BR>\n" );
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document.write( "https://www.algebra.com/statistics/Hypothesis-testing/Hypothesis-testing.faq.question.1192845.html\r<BR>\n" );
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