Answer:
D. random assignment
Explanation:
Random assignment: In a psychological experiment, the term random assignment is defined as the utility of chance procedures in research or an experiment to make sure that every subjects or participants have the probability of getting assigned to any particular group. The groups in which the participants or the subjects are randomly assigned is the treatment group, experimental group, etc.
In the question above, Betty ignored the random assignment aspect of proper research design.
Answer:
dwbdweduwbddniend djwedhwe;o dndweodo
Explanation:
They traded stuff that they can easily make or plant for stuff they can't plant or make
