document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=594024>Question 594024</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 4. The Highway Safety Department wants to study the driving habits of individuals.  A sample of 81 cars <BR>\n" );
document.write( "traveling on the highway revealed an average speed of 67 miles per hour with a standard deviation of 9 miles per <BR>\n" );
document.write( "hour.<BR>\n" );
document.write( "a. Compute the standard error of the mean.<BR>\n" );
document.write( "b. Determine a 99% confidence interval estimate for the speed of all cars. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #376666 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=376666\">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. A sample of 81 cars traveling on the highway revealed an average speed of 67 miles per hour with a standard deviation of 9 miles per hour.<BR>\n" );
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document.write( "a. Compute the standard error of the mean.<BR>\n" );
document.write( "standard error = 9/sqrt(81) = 1<BR>\n" );
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document.write( "b. Determine a 99% confidence interval estimate for the speed of all cars.<BR>\n" );
document.write( "Margin of error = 2.5758 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );