Identify the type of experiment. Brief descriptions of a number of experiments a

Question

Identify the type of experiment. Brief descriptions of a number of experiments are given. Determine whether each is observational or designed experiments. Explain your reasoning. a) 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: Select ] Reasoning: [Select ] b) A manager 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: Select Reasoning: [Select ] c) A marketer of personal computers runs ads in each of four national publications for one quarter and keeps track of the number of sales that are attributable to each publication's ad. Type: Select Reasoning: Select] d) An electric utility engages a consultant to monitor the discharge from its smokestack on a monthly basis over a 1-year period to relate the level of sulfur dioxide in the discharge to the load on the facility's generators Type: Select ] Reasoning: [ Select ]

Explanation / Answer

(a) Obseravtional Study

Reason : We are gathering information without trying to affect the members of our sample. There are no assigned experiments , only the mere observation of the data.

(b) Designed Experiment

Reason : The programs are being installed to produce certain results. Our sample observation are being affected. Hence it is a designed experiment.

(c) Observational Study

Reason : The changes are being observed and no experiments are conducted for the purpose of producing certain results.

(d) Observational Study

Reason : The observations are taken without affecting our samples. The samples are just measured without any intention of affecting them.

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