document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1086667>Question 1086667</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Nationwide, the average waiting time until a electric utility customer service representative answers a call is 210 seconds. The Gigantic Kilowatt Energy Company randomly sampled 30 calls and found that, on average, they were answered in 183 seconds with a population standard deviation of 30 seconds. Can the company claim that they are faster than the average utility at &#945; = 0.05?\r<BR>\n" );
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document.write( "a. Yes, because the test value –4.93 falls in the critical region.<BR>\n" );
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document.write( "b. No, because the test value –0.90 falls in the critical region.<BR>\n" );
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document.write( "c. Yes, because the test value –0.16 falls in the critical region.<BR>\n" );
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document.write( "d. No, because the test value –0.16 falls in the critical region.<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 #700906 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=700906\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Nationwide, the average waiting time until a electric utility customer service representative answers a call is 210 seconds. The Gigantic Kilowatt Energy Company randomly sampled 30 calls and found that, on average, they were answered in 183 seconds with a population standard deviation of 30 seconds. Can the company claim that they are faster than the average utility at &#945; = 0.05?<BR>\n" );
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document.write( "Ho: u >= 210<BR>\n" );
document.write( "Ha: u < 210 (claim)<BR>\n" );
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document.write( "z(183) = (183-210)/(30/sqrt(30)) = -4.93<BR>\n" );
document.write( "Reject interval:: z < -1.96<BR>\n" );
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document.write( "Conclusion:: Reject Ho<BR>\n" );
document.write( "Conclusion:: Accept the claim<BR>\n" );
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document.write( " Answer:<BR>\n" );
document.write( "a. Yes, because the test value –4.93 falls in the critical region.<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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