document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=925538>Question 925538</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A researcher wants to study the mean amount of time (in minutes) that kindergartners spend watching TV each day. <BR>\n" );
document.write( "Find the sample size necessary to estimate the mean with a 10-min margin of error. Assume that a 90% confidence <BR>\n" );
document.write( "level is desired and that a pilot study showed that the standard deviation is estimated to be 44min </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #561584 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=561584\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A researcher wants to study the mean amount of time (in minutes) that kindergartners spend watching TV each day. <BR>\n" );
document.write( "Find the sample size necessary to estimate the mean with a 10-min margin of error. Assume that a 90% confidence <BR>\n" );
document.write( "level is desired and that a pilot study showed that the standard deviation is estimated to be 44min<BR>\n" );
document.write( "------<BR>\n" );
document.write( "n = [z*s/E]^2<BR>\n" );
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document.write( "n = [1.645*44/10]^2 = 53 when rounded up<BR>\n" );
document.write( "---------------<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "--------------- </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );