The National Highway Traffic Safety Administration (NHTSA) conducted a survey to leam about how drivers throughout...

 

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The National Highway Traffic Safety Administration (NHTSA) conducted a survey to leam 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. Driver Using Seat Belt? Region Yes No Northeast 123 49 Midwest 164 54 South 296 71 West 252 48 Total 835 222 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 2003 survey results? Select your answer- c. What is the probability of seat belt usage by region of the country (to 2 decimals)? Northeast Midwest South West The National Highway Traffic Safety Administration (NHTSA) conducted a survey to leam 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. Driver Using Seat Belt? Region Yes No Northeast 123 49 Midwest 164 54 South 296 71 West 252 48 Total 835 222 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 2003 survey results? Select your answer- c. What is the probability of seat belt usage by region of the country (to 2 decimals)? Northeast Midwest South West