document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=925783>Question 925783</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A previous finding states that thirty-five percent of adults Americans are regular voters.  A new survey was conducted. A random sample of 250 adults in a medium size college town were surveyed , and it was found that 110 were regular voters.  Estimate the true proportion of regular voters with 90% confidence </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #561786 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=561786\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Ho: p = .35 (claim)<BR>\n" );
document.write( "Ha: p &#8800;  .35<BR>\n" );
document.write( "....<BR>\n" );
document.write( "re TY, No, do a z-stat... .44 did not happen by accident...claim is rejected<BR>\n" );
document.write( "sample: phat = 110/250 = .44<BR>\n" );
document.write( "z(.44) = ( .44-.35)/sqrt[0.35*.65/250] = .09/.03 = 3 (Off the charts)<BR>\n" );
document.write( "p(z > 3) = .001 < .10   Reject Ho<BR>\n" );
document.write( ".....<BR>\n" );
document.write( "Estimate the true proportion of regular voters with 90% confidence<BR>\n" );
document.write( "ME = 1.645 sqrt[0.35*.65/250] = .049  (Used the old .35 here to calculate ME)<BR>\n" );
document.write( "CI:  .44 - .05 < u < .44 + .05  (Used the .44 here)<BR>\n" );
document.write( "CI: (.39, .49)\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );