If a chart shows wildly fluctuating data in the A phase, the clearest problem in interpreting that design is:
A) Lack of stability
B) Order effects
C) Concomitant variation
D) All of the above

Question

Quizplus · Accepted Answer

Lack of stability in the A phase indicates that the data are not consistent, making it difficult to interpret any effects or changes that might occur in subsequent phases. This is because without a stable baseline, it's challenging to determine if any changes are due to the intervention or other variables. Order effects and concomitant variation are different issues that might affect interpretation but are not directly indicated by wildly fluctuating data in the A phase.

If a Chart Shows Wildly Fluctuating Data in the a Phase