Student Solutions Manual for Devore's Probability and Statistics for Engineering and the Sciences, 9th
9th Edition
ISBN: 9798214004020
Author: Jay L. Devore
Publisher: Cengage Learning US
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Chapter 9, Problem 71SE
The article “Quantitative MRI and Electrophysiology of Preoperative Carpal Tunnel Syndrome in a Female Population” (Ergonomics, 1997: 642–649) reported that (−473.13, 1691.9) was a large-sample 95% confidence interval for the difference between true average thenar muscle volume (mm3) for sufferers of carpal tunnel syndrome and true average volume for nonsufferers. Calculate and interpret a 90% confidence interval for this difference.
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The article "Quantitative MRI and Electrophysiology of Preoperative Carpal
Tunnel Syndrome in a Female Population" (Ergonomics, 1997: 642-649)
reported that (-473.3, 1691.9) was a large-sample 95% confidence interval
for the difference between true average thenar muscle volume (mm³) for
sufferers of carpal tunnel syndrome and true average volume for nonsuf-
ferers. Calculate a 90% confidence interval for this difference.
An article in Knee Surgery, Sports Traumatology,Arthroscopy [“Arthroscopic Meniscal Repair with an Absorbable Screw: Results and Surgical Technique” (2005, Vol. 13, pp. 273–279)] showed that only 25 out of 37 tears (67.6%) located between 3 and 6 mm from the meniscus rim were healed.(a) Calculate a two-sided 95% confidence interval on the proportion of such tears that will heal.(b) Calculate a 95% lower confidence bound on the proportion of such tears that will heal
A recent Nielsen analysis found that the typical U.S. smartphone user is spending an average of 220 minutes per day using apps. We speculate that the
average time spent using apps for Generation X smartphone users (aged 41-56 years) is less than the national average. The hypotheses are Ho: H = 220
minutes versus Ha: µ < 220 minutes. Summary results from R are provided.
Summary Statistics
Std. Dev (s)
Mean
Sample Size (n)
205 minutes
63.25 minutes
31
Chapter 9 Solutions
Student Solutions Manual for Devore's Probability and Statistics for Engineering and the Sciences, 9th
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