Homework Clinic
Mathematics Clinic => Grade 11 and 12 Mathematics => Topic started by: BrownTown3 on Jul 25, 2018
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Storks Data show that there is a positive association between the population of 17 European countries and the number of stork pairs in those countries.
a. Briefly explain what positive association means in this context.
b. Wildlife advocates want the stork population to grow, and jokingly suggest that citizens should be encouraged to have children. As a statistician, what do you think of this suggestion? Explain briefly.
Question 2
Two variables that are actually not related to each other may nonetheless have a very high correlation because they both result from some other, possibly hidden, factor. This is an example of
A) an outlier.
B) extrapolation.
C) regression.
D) leverage.
E) a lurking variable.
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Answer to Question 1
a. Positive association implies that countries with larger populations tend to have more stork pairs and countries with smaller populations tend to have fewer stork pairs.
b. This suggestion assumes that association means causation. The wildlife advocates incorrectly propose human population growth as a way to increase the number of stork pairs. Perhaps there is a lurking variable, like land mass, that accounts for the positive association between the two variables.
Answer to Question 2
E
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