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Brums [2.3K]
3 years ago
11

Which most likely explains why the United States joined NAFTA in 1993? NAFTA eliminated tariffs and united the United States eco

nomically with its two closest neighbors. NAFTA eliminated tariffs and gave the United States an economic advantage over its two closest neighbors. NAFTA eliminated tariffs and allowed the United States to keep pace economically with its two closest neighbors. NAFTA eliminated tariffs and allowed the United States to control trade with its two closest neighbors.
Social Studies
2 answers:
Elza [17]3 years ago
7 0

NAFTA eliminated tariffs for the us and its neighbors.

sp2606 [1]3 years ago
5 0

The correct answer is:

<h3>NAFTA eliminated tariffs and united the United States economically with its two closest neighbors.</h3><h3>Explanation:</h3>

Provisions. The purpose of NAFTA was to eradicate restrictions to economics and investment between the U.S., Canada, and Mexico. The implementation of NAFTA on January 1, 1994, began the instant removal of tariffs on more than one-half of Mexico's exportation to the U.S. and further than one-third of U.S. commodities to Mexico.

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In each of these instances, we have incomplete follow-up information. True survival time (sometimes called failure time) is not known because the study ends or because a participant drops out of the study before experiencing the event. What we know is that the participants survival time is greater than their last observed follow-up time. These times are called censored times.

Censoring

There are several different types of censoring. The most common is called right censoring and occurs when a participant does not have the event of interest during the study and thus their last observed follow-up time is less than their time to event. This can occur when a participant drops out before the study ends or when a participant is event free at the end of the observation period.

In the first instance, the participants observed time is less than the length of the follow-up and in the second, the participant's observed time is equal to the length of the follow-up period. These issues are illustrated in the following examples.

 

Example:

A small prospective study is run and follows ten participants for the development of myocardial infarction (MI, or heart attack) over a period of 10 years. Participants are recruited into the study over a period of two years and are followed for up to 10 years. The graphic below indicates when they enrolled and what subsequently happened to them during the observation period.

During the study period, three participants suffer myocardial infarction (MI), one dies, two drop out of the study (for unknown reasons), and four complete the 10-year follow-up without suffering MI. The figure below shows the same data, but shows survival time starting at a common time zero (i.e., as if all participants enrolled in the study at the same time).


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