Elementary Statistics (13th Edition)
13th Edition
ISBN: 9780134462455
Author: Mario F. Triola
Publisher: PEARSON
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Chapter 11.2, Problem 6BSC
In Exercises 5-18, test the given claim.
6. Splint or Surgery? A randomized controlled trial was designed to compare the effectiveness of splinting versus surgery in the treatment of carpal tunnel syndrome. Results are given in the table below (based on data from “Splinting vs. Surgery in the Treatment of Carpal Tunnel Syndrome,” by Gerritsen et al., Journal of the American Medical Association, Vol. 288, No. 10). The results are based on evaluations made one year after the treatment. Using a 0.01 significance level, test the claim that success is independent of the type of treatment. What do the results suggest about treating carpal tunnel syndrome?
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Splint or Surgery? A randomized controlled trial was designed to compare effectiveness of splinting versus
surgery in the treatment of carpal tunnel syndrome. Results are given in the table below (based on data from
"Splinting vs Surgery in the Treatment of Carpal Tunnel Syndrome," by Gerritsen et al., Journal of the
American Medical Association, Vol. 288, No. 10). The results are based on evaluations made one year after
treatment. Using a 0.01 significance level, test the claim that success is independent of the type of treatment.
Successful Treatment
Unsuccessful Treatment
Splint Treatment
Surgery Treatment
60
23
67
6.
Họ: p = 0 (Success is dependent of the type of treatment.)
HA: p +0 (Success is independent of the type of treatment.)
Hypothesis Test:
(row total) x (column total)
(Expected count) E =
table total
Test Statistic:
(01- E1)?, (02- E2)?
+
X = EE
(0-E)²
(Ok- Ek)²
1-א
X =
+... +
E1
E2
Ek
P-value
df= (r - 1)(c - 1) =
a =
Decision:
Conclusion:
Not sure how to do this
Calcium and Blood Pressure Does increasing the amount of calcium in our diet reduce blood
pressure? Examination of a large sample of people revealed a relationship between calcium intake
and blood pressure. Such observational studies do not establish causation. Researchers therefore
designed a randomized comparative experiment.
The subjects were 21 healthy men who volunteered to take part in the experiment. They were
randomly assigned to two groups: 10 of the men received a calcium supplement for 12 weeks,
while the control group of 11 men received a placebo pill that looked identical. The experiment
was double-blind. The response variable is the decrease in systolic (top number) blood pressure
for a subject after 12 weeks, in millimeters of mercury. An increase appears as a negative number.
Do the data provide convincing evidence that a calcium supplement reduces blood pressure more
than a placebo, on average, for subjects like the ones in this study?
Group 1 (calcium)
Group (placebo)…
Chapter 11 Solutions
Elementary Statistics (13th Edition)
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