Experimental subjects are left free for manipulation
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I 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)
cause and effect
If the observer and the observing equipment are unbiased then there is no reason for the study to be biased.
There are a number of ways, but I would just use an observational study.
Descriptive research includes observational methods, case study methods, and survey methods. They are used to describe situations instead of make predictions about them.
Not exactly. A survey study is a study of some topic that involves collecting data using survey methods. Such research would need to be designed properly to be effective and efficient.