The interrupted time series quasi-experimental design involves
A) making one observation immediately before and one observation immediately after a treatment is instituted.
B) using time as a dependent variable in a quasi-experiment.
C) making observations over extended periods of time both before and after a treatment is instituted.
D) comparing treatment and control groups over an extended period of time.

Question

Quizplus · Accepted Answer

The interrupted time series quasi-experimental design involves making observations over an extended period of time both before and after a treatment is instituted. This allows for the examination of trends and changes in the outcome variable over time, and the ability to attribute any observed changes to the treatment. Option A refers to a simple pre-post design, while option B may refer to a longitudinal study but not necessarily an interrupted time series design. Option D refers to a randomized controlled trial, which is a different type of experimental design.

The Interrupted Time Series Quasi-Experimental Design Involves