In dallas some fire trucks were painted yellow instead of

Reference no: EM13240712

In Dallas some fire trucks were painted yellow (instead of red) to heighten their visibility. During a test period, the fleet of red fire trucks made 143, 348 runs and had 20 accidents, while the fleet of yellow firetrucks made 135,035 runs and had 4 accidents. At a = .01, did the yellow fire trucks have a significantly lower accident rate? (a) State the hypothesis. (b) Make a decision rule and sketch it. (c) Find the sample proportions and z test statistic. (d) Make a decision. (e) Find the p-value and interpret it. (f) If statistically significant, do you think the difference is large enough to be important? If so, to whom and why? (g) Is the normality assumption fulfilled. Explain.

Statistic Red Fire Trucks Yellow Fire Trucks

Number of accidents x1 = 20 accidents x2, = 4 accidents

Number of fire runs n1 = 153,348 runs n2, = 135,050 runs

Reference no: EM13240712

Questions Cloud

A sample of 25 concession stand purchases at the may 12 : A sample of 25 concession stand purchases at the May 12 matinee of Spider-Man 3 showed a mean purchase of $ 7.29 with a standard deviation of $ 3.02. For the May 18 evening showing of the same movie.

Find the energy density in the electric field : What is the energy density in the electric field at the surface of a 2.90-cm-diameter sphere charged to a potential of 1000V

Explain how long does take to electroplate : How long does it take to electroplate 0.5 mm of gold on an object with a surface area of 31 cm2 from an Au3+(aq) solution with a 8 A current. Recall the density of gold is 19.3 g/cm3.

To test the hypothesis that students who finish an exam : To test the hypothesis that students who finish an exam first get better grades, Professor Hardtack kept track of the order in which papers were handed in.

In dallas some fire trucks were painted yellow instead of : In Dallas some fire trucks were painted yellow (instead of red) to heighten their visibility. During a test period, the fleet of red fire trucks made 143, 348 runs and had 20 accidents, while the fleet of yellow firetrucks made 135,035 runs and had 4..

What is the acceleration of the elevator : A 10 kg dog is standing on scale in an accelerating elevator. If the scale reads 5 kg, what is the acceleration of the elevator

Self-portraits-primary reason for painting a self-portrait : Self-Portraits. Journal. The Renaissance artists Titian, Rembrandt, and Durer have each painted self-portraits. Imagine yourself as one of these artists (or another artist of your choice that has painted a self-portrait) and write a journal expressin..

Explain a layer ofstationary phase thick on the inner wall : Consider the peaks for pentafluorobenzene (12.98min) and benzene(13.20min) in the chromatogram shown above. The elution timefor the unretained solute is 1.06 minutes. The open tubularcolumn is 30.0m in length and 0.530mm in diameter, with a layer ..

Interpret the following spss computer output : Interpret the following SPSS computer output for the chi-square test. Variable COMMUTE is “How did you get to work last week?” Variable GENDER is “Are you male or female?

User Account

All Pages