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wrote...
Posts: 218
2 weeks ago
Researchers investigating the association between the size and strength of muscles measured the forearm circumference (in inches) of 20 teenage boys. Then they measured the strength of the boys' grips (in pounds). Their data are plotted below.


a. Write a few sentences describing the association.
b. Estimate the correlation.   r = _______
c. If the point in the lower right corner (at about 14" and 38 lbs.) were removed, would the correlation become stronger, weaker, or remain about the same?
d. If the point in the upper right corner (at about 15" and 75 lbs.) were removed, would the correlation become stronger, weaker, or remain about the same?
Textbook 

Stats: Modeling the World


Edition: 4th
Authors:
Read 42 times
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Answer verified by a subject expert
wrote...
Posts: 260
2 weeks ago
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a. There is a moderate, positive, linear association between forearm circumference and grip strength among these boys. In general, the larger their forearms, the stronger their grip. One boy in particular had very large forearms and a very strong grip. There was one outlier--the boy with the second largest forearms had one of the weakest grips.
b. Actually r = 0.652 – any guess between 0.5 and 0.8 is pretty good.
c. The correlation would become stronger.
d. The correlation would become weaker.
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wrote...
2 weeks ago
Exactly what I needed for my project, TYSM
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