Question

**Preventing heart attacks:** Medical researchers
performed a comparison of two drugs, clopidogrel and ticagrelor,
which are designed to reduce the risk of heart attack or stroke in
coronary patients. A total of 6688 patients were given clopidogrel,
and 6746 were given ticagrelor. Of the clopidogrel patients, 675
suffered a heart attack or stroke within one year, and of the
ticagrelor patients, 553 suffered a heart attack or stroke. Can you
conclude that the proportion of patients suffering a heart attack
or stroke is less for ticagrelor? Let p1 denote the proportion of
patients suffering a heart attack or stroke with clopidogrel and p2
denote the proportion of patients suffering a heart attack or
stroke with ticagrelor. Use the =α0.01 level of significance and
the critical value method.

State the null and alternate hypotheses

Choose a significance level and find the critical value(s)

Compute the test statistic.

Determine whether to reject H0.

State a conclusion at the α=0.01 level of significance.

Answer #1

Medical researchers performed a comparison of two drugs,
clopidogrel and ticagrelor, which are designed to reduce the risk
of heart attack or stroke in coronary patients. A total of 6676
patients were given clopidogrel, and 6732 were given ticagrelor. Of
the clopidogrel patients, 668 suffered a heart attack or stroke
within one year, and of the ticagrelor patients, 569 suffered a
heart attack or stroke. Can you conclude that the proportion of
patients suffering a heart attack or stroke is...

A study used 1259 patients who had suffered a stroke. The study
randomly assigned each subject to an aspirin treatment or a placebo
treatment. During a 3-year follow-up period, in Sample 1, 634
people received placebo treatments and 25 people died from heart
attack. In sample 2, 625 people received aspirin treatment and 18
died from heart attack. Let p1 denote the population proportion of
death from heart attack for those with no treatment and p2 denote
the population proportion...

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