Passenger vehicle drivers is fatal crashes by age and crash type, 2015 Above are
ID: 3262517 • Letter: P
Question
Passenger vehicle drivers is fatal crashes by age and crash type, 2015 Above are the frequencies of drivers of passenger vehicle drivers who were involved in fatal accidents by age, for the year 2015. LEAVE ALL YOUR WORK AS FRACTIONS SO I CAN SEE WHERE YOU ARE GETTING YOUR NUMBERS FROM. DO NOT REDUCE! a. Write down all the marginal totals and the grand total above. (Give one example calculation for the rows and one for the columns) b. What is the chance a driver involved in a fatal accident in 2015 is 16-19 years old? c. What is the chance a driver involved in a fatal accident was involved in a single vehicle accident? d. What is the chance that a driver involved in a fatal accident was 16-19 years old AND involved n a single vehicle accident? (show work, leave as fraction).Explanation / Answer
a.
formula:
(b) prob person is between 16-19 yrs old=0.076 (marginal prob)
(c) prob (single vehicle)=0.384 (marginal prob)
(d) prob(between 16-19 yrs old, single vehicle) = 0.033 (joint prob)
numbers joint probabilities Age Single vehicle double vehicle Age Single vehicle double vehicle marginal prob for age 16-19 1256 1642 16-19 0.033 0.043 0.076 20-24 2375 2838 20-24 0.063 0.075 0.138 25-29 1863 2514 25-29 0.049 0.066 0.116 30-59 6511 11112 30-59 0.172 0.293 0.465 60-69 1334 2554 60-69 0.035 0.067 0.103 70+ 1193 2700 70+ 0.031 0.071 0.103 marginal prob for vehicle 0.384 0.616 1.000