Question

3. The herb ginkgo biloba is commonly used as a treatment to prevent dementia. In a study of the effectiveness of this treatment, 1545 elderly subjects were given ginkgo and 1524 elderly subjects were given a placebo (not including the drug). Among those in the ginkgo treatment group, 246 later developed dementia, and among those in the placebo group, 277 later developed dementia. We want to use a 0.01 significance level to test the claim that ginkgo is effective in preventing dementia. Test this claim using the critical value method. (10 points) a. Formal hypotheses b. Critical value(s) c. Test statistic d. State your conclusion in nontechnical language

Answer #1

The herb ginkgo biloba is commonly used as a treatment to
prevent dementia. In a study of the effectiveness of this
treatment, 1545 elderly subjects were given ginkgo and 1524 elderly
subjects were given a placebo. Among those in the ginkgo treatment
group, 246 later developed dementia, and among those in the placebo
group, 277 later developed dementia (based on data from “Ginkgo
Biloba for Prevention of Dementia,” by DeKosky et al., Journal of
American Medical Association, Vol. 300, No....

The herb ginkgo biloba is commonly used as a treatment to
prevent dementia. In a study of its effectiveness, 1544 elderly
subjects were given ginkgo and 1543 elderly subjects were given a
placebo. Anong those in the ginkgo group, 250 later developed
dementia, and among those in the placebo group, 296 developed
dementia. Use a 0.05 significance level to test the claim that
ginkgo is effective in preventing dementia. Based on your results,
is ginkgo effective in preventing dementia?
TYPE...

In a randomized double-blind, placebo-controlled trial of
children, an herb was tested as a treatment for upper respiratory
infections in children. "Days of fever" was one criterion used to
measure effects. Among 320 children treated with the herb, the
mean number of days with fever was 0.81 with a standard deviation
of 1.42 days. Among 372 children given a placebo, the mean number
of days with fever was 0.62 with a standard deviation of 1.15 days.
Use a 0.05 significance...

Lipitor is a drug used to control cholesterol. In clinical
trials of Lipitor, 420 subjects were treated with Lipitor and 740
subjects were given a placebo. Among those treated with Lipitor,
181 developed infections. Among those given a placebo, 274
developed infections. Test the claim that the rate of infection for
those treated with Lipitor was more than rate of infection for
those given a placebo. at the .05 significance level.
Claim: Select an answer u 1≠u 2 u 1...

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