Which of the following evaluation and data collection methods would offer the strongest conclusions on the effectiveness of a training program?

A) single-group design
B) pre-post design
C) time series design with control group
D) post-only design

Time Series Design

A research design that involves observations of a particular variable or variables over a set period, allowing for the analysis of trends or changes over time.

Training Program

An organized course or set of courses designed to equip participants with specific skills or knowledge.