Differential drop-out rates in your experimental and control groups (selection-attrition) is most likely to be a problem in which of the following designs: a. time series
b. regression discontinuity
c. pretest-posttest control group
d. nonequivalent comparison group

the correct answer is ) possibility.

demonstrating opportunity cost is done through production possibility.

the opportunity cost can be demonstrated using the production possibility frontier or curve. this graphic shows the total number of possibilities for two products when we have the resources needed and used in an efficient manner. the main resources could be money, labor, and technology. the curve shows that the production of one good increases when the production of the othe

answer; acquired mainly during early childhood;

answer; because they must appeal to a broad cross-section of the population;