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Concept explainers
(a)
To find: Whether J’s bones are healthier or M’s bone healthier
(a)
![Check Mark](/static/check-mark.png)
Answer to Problem 14E
M's bones are healthier than J's bones.
Explanation of Solution
Given:
Mean bone density of M =
Mean bone density of G =
Calculation:
Since J's standardized score is negative this means her bone density in hip is 1.45 standard deviation less than the average bone density in hip of population of 25-year-old women like J and M's standardized score is positive this means her bone density in hip is 0.50 standard deviation above the average bone density in hip of population of 35-year-old women like M. This means M's bones are healthier than Judy's bones.
Conclusion:
Therefore, M's bones are healthier than J's bones.
(b)
To find: the standard deviation of the bone density in M’s reference population.
(b)
![Check Mark](/static/check-mark.png)
Answer to Problem 14E
The standard deviation of the bone density in M’s reference population is 8
Explanation of Solution
Calculation:
M's results indicate a bone density in hip of
J's results indicate a bone density in hip of 948 g/cm2 and a standardized score of
The older age group has a standard deviation of
Conclusion:
The standard deviation of the bone density in M’s reference population is 8
Chapter 2 Solutions
The Practice of Statistics for AP - 4th Edition
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