Homework SourseQuestion 15 A traffic safety company publishes reports about
Question 15
A traffic safety company publishes reports about motorcycle fatalities and helmet use. The distribution shows the proportion of fatalities by location of injury for motorcycles accidents. The accompanying data tables show the location of injury and fatalities for 2046 riders not wearing a helmet. Complete parts (a) and (b)
FULL DATA SET:
Proportion of fatalities by location of injury for motorcycle accidents
Location of injury, Multiple Locations, Head, Neck, Throrax, Abdomen/Limbar/spine
Proportion 0.57 0.31 0.03 0.06 0.03
_________________________________________________________________
Location of injury and fatalities for 2046 riders not wearing a helmet
Location of injury, Mutiple locations, Head, Neck, Throax, Abdomen/Limbar/Spine
Number 1036 864 38 83 25
_________________________________________________________________
(a) Does the distribution of fatal injuries for riders not wearing a helmet follow the distribution for all riders? Use the level of significance a = 0.01
Yes or no
(b) Compare observed and expected counts for each category. What does this information tell you?
a. Wearing a helmet does not increase anybody
Solution
FULL DATA SET:
Proportion of fatalities by location of injury for motorcycle accidents
Location of injury, Multiple Locations, Head, Neck, Throrax, Abdomen/Limbar/spine
Proportion 0.57 0.31 0.03 0.06 0.03
_________________________________________________________________
Location of injury and fatalities for 2046 riders not wearing a helmet
Location of injury, Mutiple locations, Head, Neck, Throax, Abdomen/Limbar/Spine
Number 1036 864 38 83 25
_________________________________________________________________
Goodness of Fit Test
observed
expected
O - E
(O - E)
| Goodness of Fit Test | ||||
| observed | expected | O - E | (O - E) |
