The analysis for total crashes indicates that approximately 8 crashes were expected at the site without safety treatment while 3 crashes were observed after treatment during the 2.2 year after period. This difference in a reduction of approximately 5 crashes (2.3 per year) . Is this difference significantly different? Please show the work. please show step by step .
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Given : 8 crashes were expected at the site without safety treatment while 3 crashes were observed after treatment during the 2.2 year after period.
To find : Is difference significantly different
Solution:
Crashes expected at the site without safety = 8
Crashes observed after Treatment = 3
Reduction in Crashes = 8 - 3 = 5
Reduction % = (5 /8) * 100
= 5 * 25/2
= 125/2
= 62.5 %
62.5 % reduction in crashes is significant difference
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