Author Question: In a study of the effects of a reduced speed limit on arrests for speeding, it was discovered that ... (Read 15 times)

dakota nelson · **on:** Aug 4, 2018

In a study of the effects of a reduced speed limit on arrests for speeding, it was discovered that the police had switched from radar to Vascar (a new way of measuring the speed of an oncoming car).

What possible confounding factor did this switch introduce?

A) instrumentation
B) history
C) maturation
D) regression to the mean

Question 2

If researchers were interested in studying the effects of New York State's raising of the drinking age to 21 on traumatic brain injury, what type of research design would be ideal?

A) a standard 2 X 2 factorial
B) an equivalent control-group design
C) a between-subjects design
D) an interrupted time-series design