The National Highway Traffic Safety Administration found that, among motor vehicle crashes with recorded times, EMS notification time exceeded five minutes in 10.2% of urban fatal crashes. Six hundred randomly selected urban fatal crashes in Indiana showed 10.7% of the notification times exceeded five minutes. (a) The population of interest in this study is which of the following? O the National Highway Traffic Safety Administration O the 600 randomly selected urban fatal crashes in Indiana O all urban fatal crashes in Indiana O all urban fatal crashes (b) The sample obtained in this study is which of the following? O the National Highway Traffic Safety Administration O the 600 randomly selected urban fatal crashes in Indiana O all urban fatal crashes in Indiana O all urban fatal crashes