In an experimental group of 250 individuals, half were given regular doses of aspirin while the other half were given placebos with no effects. Test the claim that the aspirin group has a significantly lower heart attack rate than the placebo group.
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Expert's answer
2020-12-17T19:05:10-0500
H0: mean heart attack rate of aspirin group = mean heart attack rate of placebo group
HA: mean heart attack rate of aspirin group < mean heart attack rate of placebo group
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