document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=311235>Question 311235</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Air Transportation data from 1969-1998 collected from  www.air-transport.org Assume it is a binomial distribution (fatal vs not fatal)\r<BR>\n" );
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document.write( "Year	1969	70	71	72	73	74	75	76	77	78	79	80	81	82	83	84	85	86	87	88<BR>\n" );
document.write( "Accidents	7	2	6	7	6	7	2	2	3	5	4	0	4	4	4	1	4	2	4	3<BR>\n" );
document.write( "Year	1989	90	91	92	93	94	95	96	97	98										<BR>\n" );
document.write( "Accidents	8	6	4	4	1	4	2	3	3	0										\r<BR>\n" );
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document.write( "a.)	Find the mean and standard deviation of the number of fatal air travel accidents in 1997.  There were 8 million flights.   <BR>\n" );
document.write( "b.)	Could a person claim that 8 fatal crashes in a year are unusual? Explain.   </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #222657 by </B><A HREF=/tutors/aboutme.mpl?userid=Fombitz><B>Fombitz(32388)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Fombitz><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=Fombitz><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=222657\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The mean is 3.73, the standard deviation is 2.1. <BR>\n" );
document.write( "A value of 8 would give you a z-score of 2.03, a little greater than 2 standard deviations from the mean. I guess \"unusual\" is in the eye of the beholder and it would depend on your level of concern regarding airline travel. I would feel better if the mean was lower and the standard deviation smaller but I wouldn't think that 8 was unusual based on the data.  </SPAN>\n" );
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