The null hypothesis makes a claim about population parameter. A null hypothesis is a statement about the value of a population parameter. So the correct answer is (a).
An example of a null hypothesis is one that asserts that no statistical significance can be found in a collection of provided observations. A hypothesis is tested using sample data to determine how plausible it is. It is represented as H0 and is occasionally referred to as simply the "null." To determine if a theory regarding markets, investment methods, or economies is correct or wrong, quantitative analysts employ the null hypothesis, often known as the conjecture. The alternate theory contends that there is a distinction.
Therefore correct answer is (a).
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Continental drift is the geological phenomenon in which continents move. These movements at speeds of a few centimeters per year can actually be measured since the advent of satellite geodesy. The movement of continents is caused by plate tectonics.
Alfred Wegener noted at the beginning of the 20th century that the edges of some continents (particularly South America and Africa) are similar in shape, concluding that the continents were connected and separated before. The problem was that it was not known how huge land masses could move across the Earth's surface. Such a movement requires enormous power and it was not known where it came from.
Later it was known that, according to plate tectonics, the continents move as a result of convection currents in the mantle. They slowly move away from each other, bump into each other, slide under each other, or rub against each other. This causes various surface phenomena, such as earthquakes, volcanism, and slow changes, such as subsidence, mountain building and the displacement of continents.
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The Liberty Boys or "Sons of Liberty" protested the Stamp Act.
Answer: social class
Explanation: A social class can be described as a group of people within a society with similar social and economic status. The American Eurocopter company is showing their products to the group on the yatch because they belong to their target audience i.e the products are designed to appeal to individuals with taste similar to those on the yatch.
The reaction to the products by the group on the yatch could be indicative of how the social class the products are meant for would react to them as the group is a subset of their class. If the products appealed to the group, it will most likely appeal to the entire social class.
The correct answer is heroes.
Heroes are those who made extraordinary contributions to the society, or in the case above, their organizations. They made a huge difference to their organization and moved it towards a better and brighter future, and thus the company will thrive thanks to the outstanding efforts and actions of their 'hero.'