document.write( "Question 137498: In Dallas, some fire trucks were painted yellow (instead of red) to heighten their visibility. During
\n" ); document.write( "a test period, the fleet of red fire trucks made 153,348 runs and had 20 accidents, while the fleet of
\n" ); document.write( "yellow fire trucks made 135,035 runs and had 4 accidents. At α = .01, did the yellow fire trucks
\n" ); document.write( "have a significantly lower accident rate? (a) State the hypotheses. (b) State the decision rule and
\n" ); document.write( "sketch it. (c) Find the sample proportions and z test statistic. (d) Make a decision. (e) Find the
\n" ); document.write( "p-value and interpret it. (f ) If statistically significant, do you think the difference is large enough to
\n" ); document.write( "be important? If so, to whom, and why? (g) Is the normality assumption fulfilled? Explain.
\n" ); document.write( "Source: The Wall Street Journal, June 26, 1995, p. B1.
\n" ); document.write( "Accident Rate for Dallas Fire Trucks
\n" ); document.write( "Statistic Red Fire Trucks Yellow Fire Trucks
\n" ); document.write( "Number of accidents x1 = 20 accidents x2 = 4 accidents
\n" ); document.write( "Number of fire runs n1 = 153,348 runs n2 = 135,035 runs
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Algebra.Com's Answer #100605 by stanbon(75887) $\"\"$ $\"About$

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Answered as #97444
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\n" ); document.write( "Stan H. \n" ); document.write( "

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