Question

A state passes a law requiring mandatory seatbelt use and claims it has reduced traffic fatalities. While the seatbelt law was changed, speed limits were also reduced from 70 MPH to 55 MPH by the federal government. Traffic fatalities decreased during the first year of the seatbelt law. The change in the speed limits represents what kind of threat to internal validity?

Group of answer choices

Maturation effect

Instrumentation effect

Testing effect

History effect

Answer 1

The change in spped limites represents an instrumentation effect which is a threat to internal validity.

It is not Maturation effect as it is related to change in the condition of a disease or organism that occurs naturally over time and not as a result of treatment. Here an external treatment is being given by reducing the spped limits.

It is not a testing effect as we are not testing data using demographic data of past. We are doing an instrument to understand the thing.

It is not a history effect as the same was not there in histort of traffic laws.