document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=916211>Question 916211</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The accompanying data table lists measured voltage amounts supplied directly to a familys home. The power supply company states that that it has a target power supply of 120 volts. Using those home voltage amounts, test the claim that the mean is 120 volts. Use a 0.10 significance level.<BR>\n" );
document.write( "Day Volts<BR>\n" );
document.write( "1 124.2<BR>\n" );
document.write( "2 123.9<BR>\n" );
document.write( "3 123.9<BR>\n" );
document.write( "4 124.5<BR>\n" );
document.write( "5 123.4<BR>\n" );
document.write( "6 123.3<BR>\n" );
document.write( "7 123.3<BR>\n" );
document.write( "8 123.6<BR>\n" );
document.write( "9 123.5<BR>\n" );
document.write( "10 123.9<BR>\n" );
document.write( "11 123.5<BR>\n" );
document.write( "12 123.7<BR>\n" );
document.write( "13 123.8<BR>\n" );
document.write( "14 123.7<BR>\n" );
document.write( "15 123.9<BR>\n" );
document.write( "16 124.0<BR>\n" );
document.write( "17 124.2<BR>\n" );
document.write( "18 123.9<BR>\n" );
document.write( "19 123.8<BR>\n" );
document.write( "20 123.8<BR>\n" );
document.write( "21 124.0<BR>\n" );
document.write( "22 123.9<BR>\n" );
document.write( "23 123.6<BR>\n" );
document.write( "24 124.1<BR>\n" );
document.write( "25 123.4<BR>\n" );
document.write( "26 123.4<BR>\n" );
document.write( "27 123.4<BR>\n" );
document.write( "28 123.4<BR>\n" );
document.write( "29 123.3<BR>\n" );
document.write( "30 124.4<BR>\n" );
document.write( "31 123.5<BR>\n" );
document.write( "32 123.6<BR>\n" );
document.write( "33 123.9<BR>\n" );
document.write( "34 123.9<BR>\n" );
document.write( "35 123.9<BR>\n" );
document.write( "36 123.8<BR>\n" );
document.write( "37 123.9<BR>\n" );
document.write( "38 123.7<BR>\n" );
document.write( "39 123.8<BR>\n" );
document.write( "40 123.8<BR>\n" );
document.write( "A) CALCULATE THE TEST STATISTIC ________<BR>\n" );
document.write( "B) IDENTIFY THE CRITICAL VALUE __________ </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #555986 by </B><A HREF=/tutors/aboutme.mpl?userid=ewatrrr><B>ewatrrr(24785)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ewatrrr><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=ewatrrr><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=555986\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Re TY<BR>\n" );
document.write( "Ho mean = 120<BR>\n" );
document.write( "Ha mean &#8800;  120<BR>\n" );
document.write( "two- tailed testing as written above: .05 on either side</u><BR>\n" );
document.write( "Sample: mean = 123.7625 and s = .293247<BR>\n" );
document.write( "The assignment called for the t-test: t = (x-bar-120)/(s/&#8730;n)<BR>\n" );
document.write( "Critical value is then ± 1.685,  invT(.05,49)& invT(.95, 49)<BR>\n" );
document.write( ".....<BR>\n" );
document.write( "As to  desired t(sample mean)= 81.147  = 3.7625/.0463664 = 81.147<BR>\n" );
document.write( "Obtaining that exact number to the thousandths place... will depend on decimal points used along the way..<BR>\n" );
document.write( "Important, is that  t(123.7625) so far exceeds the critical value,  Ho is rejected.<BR>\n" );
document.write( "Wish You the Best in your Studies. <BR>\n" );
document.write( "1. Always important to know number of decimal points that are expected for the desired answer  as to: (x-bar-120)/(s/&#8730;n) for ex <BR>\n" );
document.write( "2. Does the exercise call for the t-test <BR>\n" );
document.write( "If Population SD is unknown, t-test is recommended.<BR>\n" );
document.write( "3. The Ho and Ha as written above calls for a two tailed. <BR>\n" );
document.write( "That is t(123.76)= 81.147 was to be compared to critical t-value 1.635\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );