The number of degrees of freedom for the appropriate chi-square distribution in a test of independence is EQUAL TO THE SAMPLE SIZE, MINUS ONE.
The correct answer is - This research would be eligible for exemption because the researcher is not interacting with the children and the playground is a public setting. This type of research does not need IRB (IRB being institutional review board also known as ethics committee) review because the researcher will not be interacting with the children in anyway, it is purely observational and the setting is a public place, in addition all children will remain anonymous in the study, therefore the researcher is not breaking any code of ethics.
The correct answer is: C) New mountains are created through tectonic and volcanic activity.
There are three ways in which mountains are formed, therefore there are three different types of mountains: volcanic, fold and block mountains.
It is important to say that these always involve plate tectonics, were huge "compressional forces, isostatic uplift and igneous (magma) matter, forces surface rock upward". In this way a landform higer than the surroundings is created, that is to say: a mountain.
There is no way a mountain is created by one of the other options given.
Such perils like hail, windstorms, fire, lightning, and vandalism are covered by the homeowners’ insurance policy but there are also essential components are excluded just like earthquakes and flood because both are coming without warning and can cause too much damage.
The answers to your question are,
A. Flat bottomed boats;
B. Carts driven by animals;
D. Seagoing vessels.
-Mabel <3
