Question

1. rob researched accident statistics in his community. he learned that, in the past year, 20 people were injured in car accidents and 5 people were injured in motorcycle accidents. rob inferred, \it is safer to ride a motorcycle than it is to drive a car.\ is rob’s inference valid? explain.

Explanation:

Rob's inference only uses raw injury counts, not the exposure rate (how many people drive cars vs. ride motorcycles in the community). Far more people typically drive cars, so a higher absolute number of car accident injuries does not mean cars are less safe. To compare safety, we need injury rates (injuries per 1000 drivers/rider), not total injuries.

Answer:

Rob's inference is not valid. He only compares total injury numbers, not the rate of injuries relative to how many people use each vehicle type. Since far more people drive cars than ride motorcycles, higher total car accident injuries do not prove cars are less safe. A valid safety comparison would require injury rates (injuries per person using each vehicle), not raw counts.