document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=478987>Question 478987</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The Human Relations Department of Smallville Co. would like to include a dental plan as part of its benefits package.  The question is, how much does a typical employee and his/her family spend on annual dental expenses?  A sample of 45 employees reveals the mean amount spent last year was $1,820 with a standard deviation of $660.  Assume a normal distribution of annual dental expenses.\r<BR>\n" );
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document.write( "	A) Construct a 95% or .95 confidence interval estimate for the population mean.<BR>\n" );
document.write( "	B) The information from part A, above, was given to the President who indicated the Company could afford $1,700 per year.  Is it possible the population mean could be $1,700?  Justify your answer.<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 #328214 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=328214\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The Human Relations Department of Smallville Co. would like to include a dental plan as part of its benefits package. The question is, how much does a typical employee and his/her family spend on annual dental expenses? <BR>\n" );
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document.write( "A sample of 45 employees reveals the mean amount spent last year was $1,820 with a standard deviation of $660. Assume a normal distribution of annual dental expenses. <BR>\n" );
document.write( "A) Construct a 95% or .95 confidence interval estimate for the population mean.<BR>\n" );
document.write( "ME = 1.96*660/sqrt(45) = 192.84<BR>\n" );
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document.write( "95%CI: 1820-192.84 < u < 1820+192.84<BR>\n" );
document.write( "1627.16 < u < 2012.84<BR>\n" );
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document.write( "B) The information from part A, above, was given to the President who indicated the Company could afford $1,700 per year. Is it possible the population mean could be $1,700? Justify your answer.<BR>\n" );
document.write( "We have 95% confidence the population mean is beween 1627.16 and 2012.84<BR>\n" );
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document.write( "We might be wrong.<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.\r<BR>\n" );
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