What is the primary reason young drivers have higher crash rates than other groups of drivers? A) Young drivers drive older model cars.
B)Young drivers' parents are passengers in the car.
C)Young drivers are inexperienced.
D) All of the above.

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Using mr smith and his id, identify two potential internal validity threats that might affect the a—b design. tell me how that threat might impact conclusions in the a—b design. note #1: you cannot use maturation (since i already did that one for note #2: there are some mr smith id threats that won’t have much impact in a single case design.