She did the right thing, by banning the computers and cellphones.
<span>In randomized controlled trials, people are randomly assigned to each category to offset any potential bias.
</span>Selection bias<span> is the phenomenon where</span><span> the </span>selection<span> of people or groups is not adequately randomized to offset potential bias in research studies. This in turn does not ensure that the study samples included in research are representative of the population needed to be tested on.</span>
Answer:
An ellipse is a specific curve: the closed path taken by a point that moves in such a way that the sum of its distance from two fixed points (called foci) is constant. For a satellite orbiting a planet, one focus is at the center of planet; the other focus could be internal or external to the planet. It is called an ellipse.
Explanation:
