The National Highway Traffic Safety Administration (NHTSA) conducted a survey to

Question

The National Highway Traffic Safety Administration (NHTSA) conducted a survey to learn about how drivers throughout the United States are using seat belts (Associated Press, August 25, 2003). Sample data consistent with the NHTSA survey are as follows. a. Combining the results from all four regions, what is the probability that a U.S. driver is using a seat belt (to 2 decimals)? b. The seat belt usage probability for a U.S. driver a year earlier was 75. NHTSA chief Dr. Jeffrey Runge had hoped for a 78 probability in 2003. Would he have been pleased with the 2003 c. What is the probability of seat belt usage by region of the country (to 2 decimals)? Northeast Midwest South West

Explanation / Answer

Ans:

a)P(usinf seat belt)=835/(835+222)=835/1057=0.79

b)Yes,as probability of wearing seat belt in 2003 is >0.78

c)

Yes(x) Prob.=x/835 Northeast 123 0.15 midwest 164 0.20 south 296 0.35 west 252 0.30 Total 835
1

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