Determine whether the study depicts an observational study or an experiment. upper a poll is conducted by a school's math department in which tenth dash grade students are asked if they prefer to be in their math class or their english class. nothing choose the correct description of the study.
a. the study is an observational study because the researchers control one variable to determine the effect on the response variable.
b. the study is an observational study because the study examines individuals in a sample comma but does not try to influence the response variable.
c. the study is an experiment because the researchers control one variable to determine the effect on the response variable.
d. the study is an experiment because the study examines individuals in a sample, but does not try to influence the variable of interest.

B. The study is an observational study because the study examines individuals in a sample comma but does not try to influence the response variable.    

Explanation:

Observational studies are studies in which the researchers try to observe the effect of a diagnostic test, treatment, and risk factor without making any change in who is exposed to it and vice-versa. In the observational study, the researcher collect data based on what is heard and seen. In the observational study, the researcher has no control over the variables.

There are three types of observational studies:

1. Case-control studies

2. Cohort studies

3. Cross-sectional studies.

trade regulation is a field of law, often bracketed with antitrust (as in the phrase “antitrust and trade regulation law”), including government regulation of unfair methods of competition and unfair or deceptive business acts or practices. antitrust law is often considered a subset of trade regulation law. franchise and distribution law, consumer protection law, and advertising law are sometimes considered parts of trade regulation law.

in general the theory of economics says that the more open to trade a country is the better   the result for the same country and the whole economies.

in real life countries impose taxes, quotas, etc which is not so good for the economies.

this kind of commercial war between the usa and china is slowing down the growth of the whole world so we can say that it is a draw back of trade regulations. and the free trade agreements are benefits of trade regulations.

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