\"Exercise Beats Calcium at Boosting Girl\'s Bones\" reports on a study publishe
ID: 3041902 • Letter: #
Question
"Exercise Beats Calcium at Boosting Girl's Bones" reports on a study published in the Journal of Pediatrics in 2004 that found that "girls with better muscle development also had stronger bones." Muscle development was measured in terms of the girls' lean body mass, and the study's author explained: "A 1 kilogram increase in lean mass was associated with a 21% increase in their bone strength."21 C. 5.43 d. *5.45 Ex res ot a. Can we assume this was an experiment b. Did the individuals studied constitute a c. Did the study find a positive or a d. Is the number 2) referring to the or an observational study? sample or an entire population? negative correlation? th be hu 5.46 A ul th correlation r, the intercept bo, or the slope b1? e. Is the number 24 a statistic or a th parameter? f. If researchers want to conclude that there is a relationship between muscle development and bone strength for al girls, are they mainly concerned with data production, displaying and summarizing data, probability, or statistical inference?Explanation / Answer
Answer:
a).
We can assume it is observational because there is no intervention mentioned.
b).
Sample
c).
positive correlation ( increase in lean mass associated with increase in bone strength).
d).
The slope b1.
e).
Statistic
f).
Data production. ( for generalizing the results to all girls, selection of girls should ne random. The sample to be representative of population).
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