An example of history confounding the results of an interrupted ...

[asd123]

An example of history confounding the results of an interrupted time-series design on the effect of a speed limit reduction could be
 
  A) an increased number of patrol cars.
  B) an increased number of tickets being given.
  C) an increase in the fine for tickets.
  D) All of the above

Question 2

In time-series designs, what are the two major potential confounding factors that are difficult to control without the addition of a comparison group?
 
  A) instrumentation and history
  B) regression to the mean and instrumentation
  C) history and attrition
  D) instrumentation and selection

[asdfghjkl;]

Answer to Question 1

Answer: D

Answer to Question 2

Answer: A

[asd123]

Thanks

[asdfghjkl;]

Welcome