document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1039651>Question 1039651</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Cecilia wants to know what percent of the seventh-grade students at her school are bilingual. She surveyed a random sample of seventh and eighth grade students at her school. Which of the following best explains why this sample is or is not a representative of the population Cecilia wants to study?\r<BR>\n" );
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document.write( "A. The sample is representative, because it is a random sample.<BR>\n" );
document.write( "B. The sample is not representative because it is a random sample.<BR>\n" );
document.write( "C. The sample is not representative because it included eight grade students.<BR>\n" );
document.write( "D. The sample isn't represtative, because it does not include every seventh grade student in the school.\r<BR>\n" );
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document.write( "A: I think the answer is A.<BR>\n" );
document.write( "B. It's not b because random samples are representative.<BR>\n" );
document.write( "C. The eighth grade students dont interfere with her survey.<BR>\n" );
document.write( "D. I think it can be D, however I am more confident in A.\r<BR>\n" );
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document.write( "Am I correct? If so why not </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #654729 by </B><A HREF=/tutors/aboutme.mpl?userid=solver91311><B>solver91311(24713)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=solver91311><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=solver91311><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=654729\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <font face=\"Times New Roman\" size=\"+2\">\r<BR>\n" );
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document.write( "Of course, the presence of 8th-grade students' responses skew the survey.  If you wanted to know what percentage of 25 to 30-year-old women participate in Pilates, would you include data from a group of 40-year-old men?  Every participant in a survey must be a member of the group about which you want to draw conclusions. That's why survey instruments gather demographic data as well as data that is the subject of the study.\r<BR>\n" );
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document.write( "So, A is wrong.  B is wrong for the reason you stated.  C is right for the reasons I gave. And D is wrong because not getting a response from everyone in the population is the whole point of random sampling.  What if Cecilia wanted to study all seventh-grade students in the state she lives in?  There are situations where it is impossible, or at least prohibitively expensive to survey every member of a population under study.\r<BR>\n" );
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document.write( "John<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE e^{i\pi}\ +\ 1\ =\ 0\"><BR>\n" );
document.write( "My calculator said it, I believe it, that settles it<BR>\n" );
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document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\Large \ \\r\"> </SPAN>\n" );
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