In the peterson and peterson study, participants saw three sets of random letters (for example, mtz, pwh, kql) and then counted backward by 7 from a numeric prompt (for example, 358) for set time intervals of three to eighteen seconds. finally, participants recalled as many letters as possible. in this test of the duration of short term memory, the purpose of counting backward by 7 is:

Keeping the short term memory busy.

Explanation:

The technique given in the example Peterson and Peterson study is named "Brown Peterson Technique" where the participants are given a small amount of information that they are asked not to forget and then the counting task is performed which is done for the purpose of keeping the participants from memorizing the earlier information. After they are done counting, the participants are asked to recall the first information, the letters that they were given. This experiment proves that when a new learned information is not rehearsed while it is in the short term memory, it is deleted after a period of approximately 18-20 seconds.

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michael joseph jackson was an american singer, songwriter, and dancer. dubbed the "king of pop", he is widely regarded as one of the most significant cultural figures of the 20th century and one of the greatest entertainers of all time.

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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.