document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=137871>Question 137871</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Does anyone know what the formula for the z test for proportions is???\r<BR>\n" );
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document.write( "I have a few more questions that I really need help with solving. \r<BR>\n" );
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document.write( "1) Joan moves into her apartment and wants to purchase a new couch. She wants to determine if there is any difference between the average cost of couches at two different stores. Test the hypothesis that there is no difference at a=0.05.\r<BR>\n" );
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document.write( "_          Store 1              Store 2<BR>\n" );
document.write( "x            $650                 $730<BR>\n" );
document.write( "O             $61                   $78<BR>\n" );
document.write( "n              24                    21\r<BR>\n" );
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document.write( "2) Stating that the area under the curve between z=0 and z=1.00 is 0.3413 is the same as stating that the _________________ of selecting any z value between 0 and 1.00 is  0.3413. \r<BR>\n" );
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document.write( "3) A regression line was calculated as y = 9.7 -3.2x. The slope of this line is -3.2. True or false??\r<BR>\n" );
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document.write( "4) The ________________  are the number of values that are free to vary after sample statistic has been computed. \r<BR>\n" );
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document.write( "Thank you for any and all help that you can give me. I am really confused. <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 #100783 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=100783\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Does anyone know what the formula for the z test for proportions is??? <BR>\n" );
document.write( "Most textbooks use a t-test on proportion problems and on mean problems<BR>\n" );
document.write( "where n is less than 30.<BR>\n" );
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document.write( "Z-values are critical values and are test statistics for one and two<BR>\n" );
document.write( "sample proportions tests.<BR>\n" );
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document.write( "I have a few more questions that I really need help with solving. <BR>\n" );
document.write( "1) Joan moves into her apartment and wants to purchase a new couch. She wants to determine if there is any difference between the average cost of couches at two different stores. Test the hypothesis that there is no difference at a=0.05. <BR>\n" );
document.write( "_ Store 1 Store 2<BR>\n" );
document.write( "x $650 $730<BR>\n" );
document.write( "O $61 $78<BR>\n" );
document.write( "n 24 21 <BR>\n" );
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document.write( "What are your \"x\" and \"o\" numbers.<BR>\n" );
document.write( "The \"x\" looks like a sample mean<BR>\n" );
document.write( "The \"o\" might be a sample standard deviation.<BR>\n" );
document.write( "But it's hard to be sure.<BR>\n" );
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document.write( "2) Stating that the area under the curve between z=0 and z=1.00 is 0.3413 is the same as stating that the PROBABILITY of selecting any z value between 0 and 1.00 is 0.3413. <BR>\n" );
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document.write( "3) A regression line was calculated as y = 9.7 -3.2x. The slope of this line is -3.2. True or false??<BR>\n" );
document.write( "Ans: true<BR>\n" );
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document.write( "4) The ________________ are the number of values that are free to vary after sample statistic has been computed. <BR>\n" );
document.write( "Sounds like degrees of freedom but I am not sure.<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.\r<BR>\n" );
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