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WebAssign for Rosner's Fundamentals of Biostatistics, 8th Edition [Instant Access], Single-Term
8th Edition
ISBN: 9780357452905
Author: Rosner
Publisher: Cengage Learning US
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Chapter 12, Problem 64P
To determine
Test whether there is significant difference in mean change, in percent stenosis among the four groups.
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Dark Chocolate for Good Health
A study¹ examines chocolate's effects on blood vessel function in healthy people. In the randomized, double-blind, placebo-controlled
study, 11 people received 46 grams (1.6 ounces) of dark chocolate (which is naturally flavonoid-rich) every day for two weeks, while a
control group of 10 people received a placebo consisting of dark chocolate with low flavonoid content. Participants had their vascular
health measured (by means of flow-mediated dilation) before and after the two-week study. The increase over the two-week period
was measured, with larger numbers indicating greater vascular health. For the group getting the good dark chocolate, the mean
increase was 1.3 with a standard deviation of 2.32, while the control group had a mean change of -0.96 with a standard deviation of
1.58.
¹Engler, M., et. al., "Flavonoid-rich dark chocolate improves endothelial function and increases plasma epicatechin concentrations in
healthy adults," Journal of the…
Neutropenia. Neutropenia is an abnormally low number of neutrophils (a type of white blood cell) in the blood. Chemotherapy often reduces the number of neutrophils to a level that makes patients susceptible to fever and infections. G. Bucaneve et al. published a study of such cancer patients in the paper “Levofloxacin to Prevent Bacterial Infection in Patients With Cancer and Neutropenia” (New England Journal of Medicine, Vol. 353, No. 10, pp. 977–987). For the study, 375 patients were randomly assigned to receive a daily dose of levofloxacin, and 363 were given placebo. In the group receiving levofloxacin, fever was present in 243 patients for the duration of neutropenia, whereas fever was experienced by 308 patients in the placebo group.
a. At the 1% significance level, do the data provide sufficient evidence to conclude that levofloxacin is effective in reducing the occurrence of fever in such patients?
b. Find a 98% confidence level for the difference in the proportions of such…
Current Attempt in Progress
Dark Chocolate for Good Health
A study examines chocolate's effects on blood vessel function in healthy people. In the randomized, double-blind, placebo-
controlled study, 11 people received 46 grams (1.6 ounces) of dark chocolate (which is naturally flavonoid-rich) every day for two
weeks, while a control group of 10 people received a placebo consisting of dark chocolate with low flavonoid content. Participants
had their vascular health measured (by means of flow-mediated dilation) before and after the two-week study. The increase over
the two-week period was measured, with larger numbers indicating greater vascular health. For the group getting the good dark
chocolate, the mean increase was 1.3 with a standard deviation of 2.32, while the control group had a mean change of-0.96 with a.
standard deviation of 1.58.
"Engler, M., et. al., "Flavonoid-rich dark chocolate improves endothelial function and increases plasma epicatechin concentrations in
healthy…
Chapter 12 Solutions
WebAssign for Rosner's Fundamentals of Biostatistics, 8th Edition [Instant Access], Single-Term
Ch. 12 - Nutrition Researchers compared protein intake...Ch. 12 - Nutrition Researchers compared protein intake...Ch. 12 - Prob. 3PCh. 12 - Prob. 4PCh. 12 - Prob. 5PCh. 12 - Pulmonary Disease Twenty-two young asthmatic...Ch. 12 - Pulmonary Disease Twenty-two young asthmatic...Ch. 12 - Prob. 8PCh. 12 - Prob. 32PCh. 12 - Gastroenterology In Table 12.39, we present data...
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