70 60 50 62 41 31 20 10 nominal B) ordinal C) interval D) ratio ide an appropria
ID: 3351946 • Letter: 7
Question
70 60 50 62 41 31 20 10 nominal B) ordinal C) interval D) ratio ide an appropriate response. 17) 17) Explain why data expressed with the Celsius temperature scale is at the interval level of measurement rather than the ratio level Determine whether the study is an observational study or an experiment. 18) 18) A medical researcher obtains a sample of adults suffering from diabetes. She randomly assigns 89 people to a treatment group and 89 to a placebo group. The treatment group receives a medication over a period of three months and the placebo group receives a placebo over the same time frame. At the end of three months the patients symptoms are evaluated. A) observational study B) experiment 19) A poll is conducted in which professional musicians are asked their ages. 19) A) observational study B) experiment 20) The personnel director at a large company would like to determine whether the company cafeteria 20) is widely used by employees. She calls each employee and asks them whether they usually bring their own lunch, eat at the company cafeteria, or go out for lunch. A) experiment B) observational study
Explanation / Answer
In an observational study, there are on conditions modified for the experimental groups. In an experimental study, conditions for experimental group are setup.
18) Here we are modifying the conditions for the treatment and the placebo group. Therefore this is a case of experimental study.
19) Here we are simply taking the ages of the professional musicians, and there are no conditions that are being influenced to the musicians. All the conditions are natural. Therefore this is a case of an observational study only.
20) Here we are asking from the currenct employees about their lunch habits, therefore we are not setting up any different environment here, this is a case of observational study.
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