Question

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.

Answer 1

H₀: mean heart attack rate of aspirin group = mean heart attack rate of placebo group

H_A: mean heart attack rate of aspirin group < mean heart attack rate of placebo group