document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=406446>Question 406446</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The Highway Safety Department wants to study the driving habits of individuals.. A sample of 100 cars traveling on the highway revealed an average speed of 60 miles per hour with a standard deviation of 11 miles per hour.<BR>\n" );
document.write( "a. Give a point estimate of the population mena<BR>\n" );
document.write( "b. Construct an 80% confidence interval estimates for the mean.<BR>\n" );
document.write( "c. Construct a 95% confidence interval estimates for the mean<BR>\n" );
document.write( "d. Discuss why the 80% and 95% cocnfidence intervals are different </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #286795 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=286795\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  The Highway Safety Department wants to study the driving habits of individuals.. <BR>\n" );
document.write( "A sample of 100 cars traveling on the highway revealed an average speed of 60 miles per hour with a standard deviation of 11 miles per hour.<BR>\n" );
document.write( "----<BR>\n" );
document.write( "a. Give a point estimate of the population mean:: 60 mph<BR>\n" );
document.write( "--------------------------------<BR>\n" );
document.write( "b. Construct an 80% confidence interval estimates for the mean.<BR>\n" );
document.write( "ME = 1.2901 = 1.4192<BR>\n" );
document.write( "80% CI: 60-1.2901 < u < 60+1.2901<BR>\n" );
document.write( "80% CI: 58.58 < u < 61.2901<BR>\n" );
document.write( "===============================<BR>\n" );
document.write( "c. Construct a 95% confidence interval estimates for the mean<BR>\n" );
document.write( "ME = 1.9842*11/sqrt(100) = 2.1826<BR>\n" );
document.write( "95% CI: 60-2.1826 < u < 62.1826<BR>\n" );
document.write( "===============================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "============<BR>\n" );
document.write( "d. Discuss why the 80% and 95% cocnfidence intervals are different<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );