dentify the tyoe of experiment. Brief descriptions of a number of experiments ar
ID: 3069815 • Letter: D
Question
dentify the tyoe of experiment. Brief descriptions of a number of experiments are given. Determine whether each is observational or designed experiments Explain your reasoning al An economist obtains the unemployment rate and gross state product for a sample of states over the past 10 years, with the objective of examining the relationship between the unemployment rate and the gross state product by census region. Type: ISelect ) b) A in a paper production facility installs one of three incentive programs in each of nine plants to determine the effect of each program on productivity. Type: I Select ] cl A marketer of personal computers runs ads in each of four national publicatio each publication's ad. ns for one quarter and keeps track of the number of sales that are attributable to Type: I Solect l Sclect ] estack on a monthly basis over a 1-year period to relate the level of sulftur dioxide in the discharge to the load on the facility's generatorsExplanation / Answer
The basic diference between observational studies and experimental design is that:
the data from a observational study is already produced/available and the researcher cannot manipulate it, he/she just has to collect it in the right way by observing, thus observational studies.
whereas, experimental designes are specifically designed by the researcher , to get the data, and by manipulating the xperiment, the data can also be manipulated.
a). Observational study.
As we see, we cannot manipulate the unemployment rate in any way. The researcher just collects the data for his/her purpose. So, this is an observational study
b).experimental design.
By changing the incentive program , the manager can manipulate the outcomes, besides it is clear that the manager himself creates this experiment. so this is and expermental design.
c) experimental design.
Changing number of ads can result in different data. So experimental design
d) observational study.
The consultant here is employed just to monitor the results, at any cost the monitor cannot change the results. So observatinal studies.
If you have any doubt, let me know in the cmment section. Thnk you
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