Concept explainers
(a)
To explain: the value r = 0.86.
(a)
Answer to Problem 22E
The
Explanation of Solution
Given:
The correlation of 0.86 confirms what we see in that scatterplot; there is a moderately strong, positive linear relationship between body weight (measured as kilograms) and brain weight (measured as grams) for 96 species of mammals. There are some outliers also.
(b)
To find: the effect of removing the elephant have.
(b)
Answer to Problem 22E
It would increase the correlation.
Explanation of Solution
Removing the outlier elephant would increase the correlation since the remaining points are more tightly clustered in a linear pattern.
Chapter 3 Solutions
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