5. There is no discernible pattern regarding the sources of impairments and associated river streams, basing on the variables from question 1. It is caused by the relativity of data to a certain factor. For example, as it could be seen on Histogram 1, agriculture has the most powerful influence on river streams, and silviculture has the least influence. However, the only conclusion is that the main reason for river streams impairment is human industrial activity. Only about 8 % of impaired river streams depend on natural reasons according to Table 1 statistics.
Using data from question 4, it could be easily seen that the most polluting state is Alaska with its 300,000 tons of toxic chemicals released into the atmosphere. It is almost three times more than the second state in this list – Ohio. Besides, there are Texas and Nevada that are almost reaching 100,000 tons polluting line. Comparing to Alaska, the other top ten industrial polluting states are not significant, which gives the US government a chance to concentrate their ecology recovering strategies on a smaller area. They are Utah, Tennessee, North Carolina, Louisiana, Indiana, and Georgia.
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6. A. As it was mentioned in the previous question, only 8% of river streams’ impairments are caused by nature. Histogram 1 with all recent statistics could be used to support the given hypothesis. For example, it is effective to summarize variables caused by human activity and compare them with non-human factors that are Unknown, Habitat Alternation.
B. The terrifying variables are assoсiated with Agriculture, Unknown, and Hydromodification. Agriculture has the most influence on river streams, and it is an integral part of every country’s economy. Thus, it is a real problem to solve. The second is Unknown, and it is confounding just because there is no explanation of this factor and how to stop it in the future. Lastly, Hydromodification is the third by importance factor that is totally related to Agriculture.
C. To increase confidence in results, some additional data or even media (video, pictures, and maps) may be used to visualize the given variables not only in numbers but in real-life situations. Besides, the other sources of information can be used, but the easiest method is to build logical relations between factors.
7. A. The given hypothesis cannot be supported because of the lack of information, which is the population of states. It is not reasonable because such factor as population is not the main cause of industries’ air pollution. Certainly, it is related in some way but not so deeply.
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B. The most confounding variable is the amount of toxic chemicals released by Alaska that has the biggest area. As it was mentioned in question 5, it exhausts three times more pollution than the second state in the list – Ohio.
C. Data such as the population of the given states should be used to compare the relation between pollution and the number of people. To be certain, one can include statistics about the percentage of each state’s population involved industrially (enterprise workers, for example).
8. A graph is the simplest way to show data in graphical format to make information more understandable and clear. Especially, it is widely-used in environmental studies. The changes of climate variables and assoсiated factors could be easily tracked and analyzed by using graphs. They significantly help to identify and predict the possible future outcomes of human activity. Moreover, it is the best way to organize statistics. Consequently, interpreting graphs is useful due to their effectiveness, agility, graphical representation of rough amounts, and the possibility of strict hypothesis’ justification.