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Vika [28.1K]
4 years ago
12

An experimental researcher selects students who had low scores on a math pre-test and high scores on a math post-test to partici

pate in a study examining the influence of a new math curriculum in an elementary school grade. What potential threat to validity exists in the experiment?
Social Studies
1 answer:
tankabanditka [31]4 years ago
4 0

Answer:

History

Explanation:

The history of the students in relation to their mathematical skills is a potential threat to validity of the experiment.

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konstantin123 [22]
B. because its free land
8 0
3 years ago
many countries in sub-saharan africa have total fertility rates that exceed 5.0. which of the following population characteristi
GaryK [48]

Many countries in sub-saharan africa have total fertility rates that exceed 5.0. High youth dependency ratio population characteristics is associated with this phenomenon.

Both in terms of area and population, Africa is the second-largest continent in the world after Asia. It makes up 20% of the planet's land area and encompasses around 30.3 million km2 (11.7 million square miles) of the planet's total surface. The continent of Africa lies on the prime meridian and the equator. Only this continent spans the temperate zones in both the north and south.

The term "population" refers to all citizens who are present in a nation or who are temporarily absent from it, as well as all aliens who have made a nation their permanent home. The number of residents in a certain area is depicted by this indicator. The annual variations in population brought on by births, deaths, and net migration are measured as growth rates.

learn more about population here

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4 0
2 years ago
46-year-old man is currently enrolled in a Phase 2 study of a drug for severe diabetic neuropathy. While the study is on going,
r-ruslan [8.4K]

Answer:

The investigador should: Discuss the pros and cons of both the investigational drug and the commercially available drug and then allow the subject to decide whether to withdraw from the research to take the new drug.

Explanation:

An investigator's ethical duty, is to keep the subject of investigation, well informed with all the details about the invesigation. At a phase 2 of the study the subject suposposedly has been informed of the prosedure, following the informed consent. So in this particular case the investigator has to present all the new information so the subject can decide for himself what is best for him.

During phase II of an investigation, it is necessary to evaluate the benefits or negative aspects of a drug, to ensure the safty and wellbeing of the subject. If a drog is known to harm a subject, the procedure would stop. In this phase is important to have the data to decide and discuss what is best for the subject.

6 0
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Brainstorm a list of food service operators
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Answer:

The top ten food service companies in 2018

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   Restaurant Brands International – $4.6bn.

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   Autogrill – $5.3bn.

   Zensho Holdings – $5.35bn.

   Yum! Brands – $5.6bn.

   Darden Restaurants – $8.3bn.

   Performance Food Group – $18.1bn.

Explanation:

5 0
3 years ago
What is a intravenous line?
g100num [7]
The intravenous line is placed into a vein. Once placed in the needle is removed. It is connected by a long piece of tubing to a bag containing fluids, nutrients, and medications.
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