document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=133947>Question 133947</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An owner of a fast food restaurant reported to corporate headquarters that the average bill paid by his customers in the last quarter was $6.20 and that the standard deviation was $1.90. Not knowing exactly what the effect would be, headquarters suddenly launched a nationwide promotional campaign featuring a large quantity discount for a multi-sandwich purchase. The stubs from the next 81 purchases at the owner’s franchise after the campaign was launched averaged $6.65. <BR>\n" );
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document.write( "Conduct the 5 step hypothesis test at a level of significance of 0.05 to determine if the promotion increased the average bill amount.  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #98234 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=98234\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> An owner of a fast food restaurant reported to corporate headquarters that the average bill paid by his customers in the last quarter was $6.20 and that the standard deviation was $1.90. Not knowing exactly what the effect would be, headquarters suddenly launched a nationwide promotional campaign featuring a large quantity discount for a multi-sandwich purchase. The stubs from the next 81 purchases at the owner’s franchise after the campaign was launched averaged $6.65. <BR>\n" );
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document.write( "Conduct the 5 step hypothesis test at a level of significance of 0.05 to determine if the promotion increased the average bill amount.<BR>\n" );
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document.write( "Ho: mu(before)-mu(after)= 0<BR>\n" );
document.write( "Ha: mu(before)-mu(after) < 0<BR>\n" );
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document.write( "Critical value for alpha = 5%: t = -1.645<BR>\n" );
document.write( "Test Statistic: t(6.20-6.65)/sqrt[(1.9^2/n1)+(s2^2/81)]= ?<BR>\n" );
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document.write( "Comment: n1 is missing from the before data; s2 is missing from<BR>\n" );
document.write( "the after data.<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.\r<BR>\n" );
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