document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1173386>Question 1173386</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Question 1:<BR>\n" );
document.write( "A sample of 10 networking sites for a specific month has a mean of 26.1 and a standard deviation of 4.2. Find the 99% confidence interval of the true mean.\r<BR>\n" );
document.write( "\n" );
document.write( "Question 2:<BR>\n" );
document.write( "In a survey of 500 infants chosen at random, it is found that 240 are girls. Are boy and girl births equally likely according to this survey (use α = 0.05)\r<BR>\n" );
document.write( "\n" );
document.write( "Question 9:<BR>\n" );
document.write( "Is the choice of exercise equipment dependent upon gender? Recent records from a large gym indicated the following equipment usage. At the 0.05 level of significance, is there a relationship?\r<BR>\n" );
document.write( "\n" );
document.write( "                     Treadmill	    Elliptical 	      Bike<BR>\n" );
document.write( "Male 		       120 	   	    60		 75<BR>\n" );
document.write( "Female                100 	   	    95		 82<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #798813 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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/cgi-bin/show-face.mpl?user=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=798813\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> half-interval is t (0.995, df=9)*s/sqrt(n)<BR>\n" );
document.write( "=3.25*4.2/sqrt(10)<BR>\n" );
document.write( "=4.32<BR>\n" );
document.write( "the 99% C( is (21.8, 30.4)<BR>\n" );
document.write( "-<BR>\n" );
document.write( "Ho: girls=0.5<BR>\n" );
document.write( "Ha: girls NE 0.5<BR>\n" );
document.write( "alpha = 0.0=p(reject Ho|Ho true}<BR>\n" );
document.write( "test stat z=(phat-p)/sqrt (p(1-p)/n)<BR>\n" );
document.write( "critical value |z|>1.96<BR>\n" );
document.write( "z=0.02/sqrt(0.25/500)<BR>\n" );
document.write( "=0.89<BR>\n" );
document.write( "fail to reject Ho. Insufficient evidence to reject the null hypothesis.<BR>\n" );
document.write( "-<BR>\n" );
document.write( "The expected value are<BR>\n" );
document.write( "105.45--74.3--75.25<BR>\n" );
document.write( "114.55--80.7--81.75<BR>\n" );
document.write( "Chi-Square is 9.14 which has a p-value of 0.01, and the evidence suggests a relationship, not independence. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );