Astudy investigates the effects of a new social welfare program on participants' ability to access housing. the study examines the participants' housing status several times before and after the program was instituted. this is an example of a design.

The correct answer is “simple interrupted time-series”

Explanation:

A time series refers to repetitive observations on a population in a period of time. In an interrupted time series studies is being analyzes the design for evaluating the success of population level health interventions that have been implemented in a certain time. In these studies, a time series is used to set a primary tendency that has been stopped by an intercession in a particular period of time.  

"choosing is refusing" means individuals face an opportunity cost with each decision they make. economists state that every decision involves trade-offs. opportunity cost is the least desirable alternative given up as a result of a decision.

well, i can't read it so i'll ask you questions about it : )

if you were a reader and you read the introduction, would you want to read more?

does it start with a question? if so, is it something you would want to read about?

and ask any friends or family for their opinion : )