WEBASSIGN ACCESS FOR PROBABILITY & STATS
9th Edition
ISBN: 9780357893111
Author: DEVORE
Publisher: CENGAGE L
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Textbook Question
Chapter 12.5, Problem 60E
Head movement evaluations are important because individuals, especially those who are disabled, may be able to operate communications aids in this manner. The article “Constancy of Head Turning Recorded in Healthy Young Humans” (J. of Biomed. Engr., 2008: 428–436) reported data on
Subj: | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
Cl: | 57.9 | 35.7 | 54.5 | 56.8 | 51.1 | 70.8 | 77.3 |
Co: | 44.2 | 52.1 | 60.2 | 52.7 | 47.2 | 65.6 | 71.4 |
Subj: | 8 | 9 | 10 | 11 | 12 | 13 | 14 |
Cl: | 51.6 | 54.7 | 63.6 | 59.2 | 59.2 | 55.8 | 38.5 |
Co: | 48.8 | 53.1 | 66.3 | 59.8 | 47.5 | 64.5 | 34.5 |
- a. Calculate a point estimate of the population
correlation coefficient between Cl AMIA and Co AMIA (ΣCl = 786.7, ΣCo = 767.9, ΣCl2 = 45,727.31, ΣCo2 = 43,478.07, ΣClCo = 44,187.87). - b. Assuming bivariate normality (normal probability plots of the Cl and Co samples are reasonably straight), carry out a test at significance level .01 to decide whether there is a linear association between the two variables in the population (as do the authors of the cited paper). Would the conclusion have been the same if a significance level of .001 had been used?
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Chapter 12 Solutions
WEBASSIGN ACCESS FOR PROBABILITY & STATS
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