Question

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. 19). We want to use a 0.01 significance level to test the claim that ginkgo is effective in preventing dementia. Identify the test statistic, equation- p value or critical value, conclusion about the null hypothesis, and final conclusion that addresses the original claim.

Answer #1

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...

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...

In a 2011 study, medical researchers from Rutgers University
randomly assigned men to take selenium, vitamin E, both selenium
and vitamin E, or placebo. The researchers then followed up to see
if the men developed prostate cancer. In this table, the observed
count appears above the expected count in each cell.
Selenium
Vitamin E
Selenium and Vitamin E
Placebo
Total
No cancer
Observed
Expected
8177
8180.3
8117
8166.3
8147
8133.5
8167
8127.9
32608
Prostate Cancer
Observed
Expected
575
571.7
620...

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