How do the interrupted time-series designs and replicated time-series designs differ? Why is the replicated design more methodologically sound?
What will be an ideal response?
The interrupted time-series design involves a single group that is observed multiple times over the course of the study. The replicated design includes more than one group, so researchers can make comparisons of changes over time across groups. In addition, in the replicated design, the treatment can be applied to different groups at different times, increasing our confidence that the threats to internal validity like history, maturation, testing, or statistical regression (regression to the mean).
You might also like to view...
Chapter 10 introduced you to within variable designs
Indicate whether the statement is true or false
When a new ordinance violates existing laws, citizens can legally challenge the issue through ________
a. policy making b. litigation c. grassroots activities d. police intervention
In Federalist no. 10, James Madison discusses the advantages of a unitary system over a confederate system
Indicate whether the statement is true or false.
Land reform during the White Revolution resulted in
a. nearly unanimous peasant support for the shah. b. massive migration of poor peasants to Tehran. c. unexpected increases in agricultural productivity. d. the creation of hundreds of new rural villages. e. a transfer of wealth to Muslim clerics.