Aschool district decides to compare a new math textbook to the textbook that has been in use for the past few years. each of the fourth graders in one school is assigned to be in one of two classes, one in which a teacher continues using the old book and another in which a new teacher uses the new book. the school administrators compare the average scores of the two classes on a mathematics standardized test at the end of the year to determine which book is better. which of the following is a potential confound in this study?

teachers have a different amount of experience with each book.

Explanation:

Based on the information provided within the question it can be said that once potential confound in this study is that the teachers have a different amount of experience with each book. Experience can affect the results drastically, since it allows the teachers to know what works and what doesn't when teaching the students. Therefore affecting the results of the standardized tests.

answer; i do believe that the employee must do the adjusting;

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.