A Gallup poll asked a sample of Canadian adults if they thought the law should allow doctors to end the life of a patient who is in great pain and near death if the patient makes a request in writing. The poll included 250 people in Quebec, 198 of whom agreed that doctor-assisted suicide should be allowed. (a) What is the margin of error of the large-sample 99.9% confidence interval for the proportion of all Quebec adults who would allow doctor-assisted suicide? MoE: (b) How large a sample is needed to get a ±3 percentage point margin of error (this is very commonly used)? Use the previous sample as a pilot study to get p*. (You may need four decimal places in your critical value to solve this problem.) Sample size:

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.