A traffic safety company publishes reports about motorcycle fatalities and helme
ID: 3324737 • Letter: A
Question
A traffic safety company publishes reports about motorcycle fatalities and helmet use. In the first accompanying datatable, the distribution shows the proportion of fatalities by location of injury for motorcycle accidents. The second data table shows the location of injury and fatalities for 2074 riders not wearing a helmet. Complete parts (a) and (b) below.
Proportion of fatalities by location of injury for motorcycle accidents
Location of injury
Multiple locations
Head
Neck
Thorax
Abdomen/ Lumbar/ Spine
Proportion
0.570
0.310
0.030
0.060
0.030
Location of injury
Multiple locations
Head
Neck
Thorax
Abdomen/ Lumbar/ Spine
Number
1032
870
38
84
50
Compute the expected counts for each fatal injury.
Location of injury
Observed Count
Expected Count
Multiple Locations
1032
nothing
Head
870
nothing
Neck
38
nothing
Thorax
84
nothing
Abdomen/Lumbar/Spine
50
nothing
(Round to two decimal places as needed.)
Full data set
Proportion of fatalities by location of injury for motorcycle accidents
Location of injury
Multiple locations
Head
Neck
Thorax
Abdomen/ Lumbar/ Spine
Proportion
0.570
0.310
0.030
0.060
0.030
Explanation / Answer
for expected count is =total frequency*probability
hence
Location of injury proportion Observed Count Expected Count=p*2074 Multiple Locations 0.57 1032 1182.18 Head 0.31 870 642.94 Neck 0.03 38 62.22 Thorax 0.06 84 124.44 Abdomen/Lumbar/Spine 0.03 50 62.22 total 1 2074 2074Related Questions
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