MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Transcribed Image Text:Passive exposure to environmental tobacco smoke has been associated with growth suppression and
an increased frequency of respiratory tract infections in normal children. Is this association more
pronounced in children with cystic fibrosis? To answer this question, 43 children (18 girls and 25
boys) attending a 2-week summer camp for cystic fibrosis patients were studied (New England Journal
of Medicine, Sept. 20, 1990). Among several variables measured were the child's weight percentile
(y) and the number of cigarettes smoked per day in the child's home (x).
a. For the 18 girls, the coefficient of correlation between y and x was reported as r = –.50. Interpret
-
this result.
b. Refer to part a. The p-value for testing Ho: p = 0 against H;: p # 0 was reported as p = .03.
n Interpret this result.
c. For the 25 boys, the coefficient of correlation between y and x was reported asr = -.12. Interpret
%3D
%3D
this result.
d. Refer to part c. The p-value for testing Ho: p = 0 against Ha: p # 0 was reported as p = .57.
Interpret this result.
%3D
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