document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=387906>Question 387906</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please help me with my homework questions on confidence intervals:<BR>\n" );
document.write( "in 1965, 44% of people never smoked. In 2006 a national survey of 1205 people, 615 never smoked cigarettes. <BR>\n" );
document.write( "1) A 96% confidence interval for the proportion of people who never smoked in 2006 is:<BR>\n" );
document.write( "I said 0.470-0.551. Is this correct?<BR>\n" );
document.write( "2)Suppose you wish to find out if there was a change from 1965-2006. What would be an appropriate hypothesis?<BR>\n" );
document.write( "I said ho: p= 0.44, ha: p > 0.44.<BR>\n" );
document.write( "Is this correct?<BR>\n" );
document.write( "3)The p-value of the test hypothesis for 5 rooms that a carpeted with a mean of 184 and a standard deviation of 27.0 and 5 uncarpeted rooms with a mean of 172 and standard deviation of 17.9 is?<BR>\n" );
document.write( "I said between .01-.05<BR>\n" );
document.write( "Is this correct? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #274214 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=274214\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 1) \r<BR>\n" );
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document.write( "You should have gotten (0.48, 0.53) as your 96% CI, what did you get for z and p?\r<BR>\n" );
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document.write( "2) \r<BR>\n" );
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document.write( "Your null hypothesis is correct, but your alternative hypothesis should be \r<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=H%5Ba%5D ALIGN=MIDDLE  ALT=\"H%5Ba%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" >: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=p%3C%3E0.44 ALIGN=MIDDLE  ALT=\"p%3C%3E0.44\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "3) \r<BR>\n" );
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document.write( "I'm not understanding the question. Are you comparing these two means? Or is one mean a sample mean and the other a population mean? I'm sure there's more to this problem.\r<BR>\n" );
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document.write( "If you're doing a significance test, then your p-value is actually much larger. </SPAN>\n" );
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