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RafaI got it right on apex. And i have noticed that sometimes apex gives you a "correct answer" as wrong, when it gives you another one of greater relevance than the one you chose. Even if yours is good. That is why on this page, although many give good options, to some they appear as incorrect.
Experimental subjects are left free OF manipulation. (Apex)
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Unlike an observational study an experiment can prove?
cause and effect
Are observational studies bias?
If the observer and the observing equipment are unbiased then there is no reason for the study to be biased.
Which method of data collection would you use to collect data for a study of the salaries of college professors at a particular college?
There are a number of ways, but I would just use an observational study.
What are the parts of descriptive research?
Descriptive research includes observational methods, case study methods, and survey methods. They are used to describe situations instead of make predictions about them.
What are the factors for determining the sample design?
In the process of developing a sampling design for this study, there are some critical factors you should consider. Explain five of these factors.
