Required to design an experiment to evaluate the

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required to design an experiment to evaluate the effectiveness of the training. Identify the correct statement with regard to the design of the experiment. A. Experiments without control groups will best show the effects of the training. B. Volunteers should be randomly assigned to either the training group or a group receiving no training. C. The quality of water is the response variable in the experiment. B. All of these responses are correct, but B is the only one that answers the question that is asked.
(2 pts.) 8. A study of the effect of living in public housing on the income and other variables in poverty-level households was carried out as follows. The researchers obtained a list of all applicants for public housing during the previous year. Some applicants had been accepted, while others had been turned down by the housing authority. Both groups were interviewed and compared. a) Which of the following is the most correct?
"Confounding could make it difficult to see the effect of the explanatory variable on the response variable."
(1 pt.) 9. You can use your computer to make telephone calls over the Internet. How will the cost affect the behavior of users of this service? You will offer the service to all 200 rooms in a college dormitory. Some rooms will pay a low flat rate. Others will pay higher rates at peak periods and very low rates off-peak. You are interested in the amount and time of use and in the effect on the congestion of the network. You are required to outline the design of an experiment to study the effect of rate structure. Identify the correct statement with regard to the design of the experiment.
5 (3 pts.) 10. "Nearly five decades of research now link aspirin to the prevention of stroke and heart attacks.” So says the Bayer Aspirin Web site, ." The most important evidence for this claim comes from the Physicians' Health Study, a large medical experiment involving 22,000 male physicians. One group of about 11,000 physicians took an aspirin every second day, while the rest took a placebo. After several

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