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Dafna1 [17]
3 years ago
13

Your analytics professor hands back the tests from the previous exam and realizes there are several exams leftover, suggesting t

hese students have skipped his class. He believes that their absence is caused by a poor performance on the test. If the theory is correct, the leftover papers will have lower scores than those papers handed back. He records the marks of the leftover papers with the marks of the returned papers. The professor wants to know if the group of papers he returned received a higher mark than the leftover papers. What is the best test to use
Social Studies
1 answer:
Amanda [17]3 years ago
8 0

Answer:

the returned papers

Explanation:

The returned papers will show the correct answers because they from students who did not skipped the class.In most cases that will help with the validity of the results if the professors wants to see the deviations with the marks obtained from both parties.

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3 years ago
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8 0
3 years ago
The above graph contains data from a study of overall biodiversity in a stream ecosystem and the population size of a particular
jeka57 [31]

Answer:

The conclusion is false, because it is assuming that correlation = causation.

Explanation:

An important principle in statistical analysis is the principle that when correlation exist between two variables or more, it does not mean that one of the variables are causing the other to appear in a certain manner.

Remember that correlation means that you are investigating whether a relationships exists between two variables; in this example, as we can see, it is between the biodiversity in an ecosystem and the population of an insect.

The graph can be said to illustrate the result of the research; that as the biodiversity of the ecosystem goes down, the insect's population goes up. This is a form of negative correlation.

However - we do not know what is the direction of the relationship; the student concludes that as some insects die within the ecosystem, the researched insect's population goes up; assuming that the predator species died off and thus the researched insect's population increases.

Yet, it is also possible for the relationship to go towards the other direction; the researched insect population increases - perhaps by the introduction of a new food source that causes the species' population to increase - and thus, this damages the biodiversity of the ecosystem, making the population go down since it is possible that the researched insect is instead the species which is on top of the food chain at that ecosystem.

To investigate the direction of a relationship, further research need to be done and more sophisticated statistical methods need to be used.

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