document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=129973>Question 129973</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I already submitted this question.  The missing data is Apha=.05. Please help me.  I am totally lost and need your help.  Thank you again\r<BR>\n" );
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document.write( "1.	The EPA is concerned about the quality of drinking water served on airline flights. A sample of 158 flights yielded poor quality water on 20 flights. At alpha=.05, does this indicate that more than 10% of flights have poor-quality water?\r<BR>\n" );
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document.write( "2.	According to the sample, 12.66% (20/158) of the flights served poor-quality water. Can you simply report to the EPA that more than 10% of all airline flights serve poor-quality water? Why or why not?\r<BR>\n" );
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document.write( "3.	If an error occurred, what type of error was it?<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #94957 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=94957\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 1. The EPA is concerned about the quality of drinking water served on airline flights.<BR>\n" );
document.write( " A sample of 158 flights yielded poor quality water on 20 flights. At alpha=.05, does this indicate that more than 10% of flights have poor-quality water? <BR>\n" );
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document.write( "Ho: p = 0.10<BR>\n" );
document.write( "Ha: p > 0.10 (right-tail test with alpha = 5%)<BR>\n" );
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document.write( "Critical value = 1.645<BR>\n" );
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document.write( "p-hat = 20/158 = 0.1266<BR>\n" );
document.write( "Test Statistic:<BR>\n" );
document.write( "z(0.1266) = (0.1266-0.10)/sqrt(0.1*0.9/158)= 46.69777...<BR>\n" );
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document.write( "Since the test statistic is greater than the critical value<BR>\n" );
document.write( "reject Ho.  There is strong statistical evidence that the <BR>\n" );
document.write( "proportion pf poor quality is not 10% \r<BR>\n" );
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document.write( "2. According to the sample, 12.66% (20/158) of the flights served poor-quality water. Can you simply report to the EPA that more than 10% of all airline flights serve poor-quality water? Why or why not? <BR>\n" );
document.write( "Since this is a test of Ho that p = 10% you can only report that the<BR>\n" );
document.write( "test shows significant  statistical evidence that the proportion is not 10%.<BR>\n" );
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document.write( "3. If an error occurred, what type of error was it?<BR>\n" );
document.write( "Type I; rejecting Ho when in fact it is true.<BR>\n" );
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document.write( "Cheers,<BR>\n" );
document.write( "Stan H.\r<BR>\n" );
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