document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=177279>Question 177279</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A U.S. dime is supposed to weigh 2.268 grams. A random sample of 15 circulated dimes showed a mean weight of 2.256 grams with a standard deviation of .026 grams.\r<BR>\n" );
document.write( "\n" );
document.write( "9.55	A U.S. dime is supposed to weigh 2.268 grams. A random sample of 15 circulated dimes showed a mean weight of 2.256 grams with a standard deviation of .026 grams.<BR>\n" );
document.write( " (a) Using &#945; = .05, is the mean weight of all circulated dimes lower than the specification? State your hypotheses and decision rule.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( " (b) Why might circulated dimes weigh less than the mint specification? (See Science News 157, no. 14 [April 1, 2000], p. 216.)\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #132354 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=132354\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A U.S. dime is supposed to weigh 2.268 grams. A random sample of 15 circulated dimes showed a mean weight of 2.256 grams with a standard deviation of .026 grams. <BR>\n" );
document.write( "9.55 A U.S. dime is supposed to weigh 2.268 grams. A random sample of 15 circulated dimes showed a mean weight of 2.256 grams with a standard deviation of .026 grams.<BR>\n" );
document.write( "(a) Using &#945; = .05, is the mean weight of all circulated dimes lower than the specification? State your hypotheses and decision rule.<BR>\n" );
document.write( "------<BR>\n" );
document.write( "Ho: u = 2.268<BR>\n" );
document.write( "Ha: u < 2.268<BR>\n" );
document.write( "----------------<BR>\n" );
document.write( "If the test statistic is less than -1.645, reject Ho.<BR>\n" );
document.write( "--------------------------------------------------------- \r<BR>\n" );
document.write( "\n" );
document.write( "(b) Why might circulated dimes weigh less than the mint specification? <BR>\n" );
document.write( "Because of wear and tear on the coins.<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );