A survey asked people how often they exceed speed limits. The data are
then categorized into the following contingency table of counts showing the relationship between
age group and response.
Exceed Limit if Possible?
Age Always Not Always Total
Under 30 100 100 200
Over 30 40 160 200
Total 140 260 400
19. Among people with age over 30, what's the "risk" of always exceeding the speed limit?
20. Among people with age under 30 what are the odds that they always exceed the speed limit?
21. What is the relative risk of always exceeding the speed limit for people under 30 compared to people over 30?
Answers
0.2 , 1 to 1 , 2.5 is relative Risk
Step-by-step explanation:
Age Exceed limit Not exceed limit Total
under 30 100 100 200
Over 30 40 160 200
TOTAL 140 260 400
Among people with age over 30, what's the "risk" of always exceeding the speed limit = (40/200) = 1/5 = 0.2
Among people with age under 30 what are the odds that they always exceed the speed limit = 100 to (200 - 100) = 100 to 100 = 1 to 1
relative risk of always exceeding the speed limit for people under 30 compared to people over 30 = (100/200)/(40/200)
= 100/40
= 2.5
2.5 is relative Risk
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