document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1188604>Question 1188604</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A small dealership leased 21 Suburu Outbacks on 2-year leases. Two years later, when the cars were returned, the mileage was recorded (see below). Is the dealer’s mean significantly different from the national average of 30,000 miles for 2-year leased vehicles, using the 10 percent level of significance? (a) What is the appropriate testing method? Please write down each step of hypothesis testing for this case. (b) Please solve this problem and show the process and the output file. (20 points total)\r<BR>\n" );
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document.write( "40060, 24960, 14310, 17370, 44740, 44550, 20250,<BR>\n" );
document.write( "33380, 24270, 41740, 58630, 35830, 25750, 28910,<BR>\n" );
document.write( "25090, 43380, 23940, 43510, 53680, 31810, 36780<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 #819862 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=819862\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> This is testing means of a variable (mileage) against a specific mean. The sd can be calculated and if assumed to be an unbiased estimator of the population's, than a 1-sample t-test would be appropriate.<BR>\n" );
document.write( "Ho: mileage= 30000<BR>\n" );
document.write( "Ha: mileage ne 30000<BR>\n" );
document.write( "alpha; 0.10 p{reject Ho|ho true}=0.10<BR>\n" );
document.write( "test is a t-test (0.90, df=20)<BR>\n" );
document.write( "critical value |t|>1.725<BR>\n" );
document.write( "calculation the mean is <BR>\n" );
document.write( "33950<BR>\n" );
document.write( "s=11866<BR>\n" );
document.write( "the output on a calculator t=1.53 p-value =0.14<BR>\n" );
document.write( "also<BR>\n" );
document.write( "t=(33950-30000)/11866/sqrt(21)<BR>\n" );
document.write( "=3950*sqrt(21)/11866<BR>\n" );
document.write( "=1.53<BR>\n" );
document.write( "fail to reject Ho, insufficient evidence to deny the claim. </SPAN>\n" );
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