Answer:
This is an example of: <u>a sample survey.</u>
Explanation:
In the experiment to determine the effect of sleep deprivation on the ability of the student to concentrate definitely needs an experimental setup rather than a randomized data collection.
<em>Do to the fact that, the experimental used a small sample sized area (Students in a calculus class) to test his hypothesis shows that the setup is a sample survey. </em>
<u>This sample survey result could be extrapolated to the whoe region (the classes in the school or whole school ) to determine if there was a major significance between the two variables.</u>
Answer:
Their problems were low wages and unsafe working conditions.
Explanation:
In the late 1800s, workers organized unions to solve their problems. ... First, workers formed local unions and later formed national unions. These unions used strikes to try to force employers to increase wages or make working conditions safer.
Answer: the water table (the groundwater level) is very near to the soil surface or shallow water covers the surface for at least part of the year
Explanation:
The Mundial Bank classifies a country as developed, developing and undeveloped according to the high, medium or low per capita income of its population.
Developed Country: It has a high develop level because it has a very good life quality in its population through high incomes, education, and sanity. Example: United States, Europe, Australia.
Developing Country: It has a medium develop level, it has scarcity in quality life because the incomes per capita aren’t enough and so there are low food levels. Example: Brazil, Russia, China.
Undeveloped Country: It doesn’t reach human developed either cultural nor economic. These countries are related to poverty and are called <em>“Third world countries”</em>. Example: Burundi or Sierra Leone
