document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=933936>Question 933936</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A poll asked for people's opinion on whether closing local newspapers would hurt civic life; 430 of 1001 respondents said it would hurt civic life a lot.\r<BR>\n" );
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document.write( "A. Find the proportion of the respondents who said closing local papers would hurt civic life a lot.\r<BR>\n" );
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document.write( "(round to three decimal places as needed)\r<BR>\n" );
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document.write( "B. Find a 95% confidence interval for the population proportion who believed closing newspaper would hurt civic life a lot. Assume the poll used a simple random sample (SRS) (In fact, it used random sampling, but a more complex method than SRS\r<BR>\n" );
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document.write( "(, ) round to three decimal places as needed\r<BR>\n" );
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document.write( "C. Find an 80% confidence interval for the population proportion who believed closing newspapers would hurt civic life a lot.\r<BR>\n" );
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document.write( "(, ) round to three decimal places as needed\r<BR>\n" );
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document.write( "D. Which interval is wider?\r<BR>\n" );
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document.write( "Thank you </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #567133 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=567133\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A poll asked for people's opinion on whether closing local newspapers would hurt civic life; 430 of 1001 respondents said it would hurt civic life a lot.<BR>\n" );
document.write( " A. Find the proportion of the respondents who said closing local papers would hurt civic life a lot. (round to three decimal places as needed)<BR>\n" );
document.write( "Ans: 430/1001 = 0.430 or 430 out of 1000<BR>\n" );
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document.write( "B. Find a 95% confidence interval for the population proportion who believed closing newspaper would hurt civic life a lot. Assume the poll used a simple random sample (SRS) (In fact, it used random sampling, but a more complex method than SRS (, ) round to three decimal places as needed <BR>\n" );
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document.write( "p-hat = 0.43<BR>\n" );
document.write( "ME = 1.96*sqrt[0.43*0.57/1001] = 0.031<BR>\n" );
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document.write( "95% CI:: 0.43-0.031 < p < 0.43+0.031<BR>\n" );
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document.write( "C. Find an 80% confidence interval for the population proportion who believed closing newspapers would hurt civic life a lot.<BR>\n" );
document.write( " (, ) round to three decimal places as needed <BR>\n" );
document.write( "ME:: 1.2820*sqrt[0.43*0.57/1001] = 0.02<BR>\n" );
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document.write( "80% CI: 0.43-0.02 < p < 0.43+0.02<BR>\n" );
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document.write( "D. Which interval is wider?<BR>\n" );
document.write( "95% CI is wider than 80% CI.<BR>\n" );
document.write( "The more confidence you want, the wider the CI must be.<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
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