In determining the recommended dosage of AZT for AIDS patients, tests were done comparing efficacy for various dosages. If a low dosage is effective, then that would be recommended, as it would be less expensive and would have fewer potential side effects.

A test to decide whether a dosage of 1, 200 mg is similar to one of 400 mg is performed on two random samples of AIDS patients. A numeric measurement of a patient’s health is made, and the before-and-after differences are recorded after treatment:

Find a 90% confidence interval for the differences of the means. What do you assume about the data?

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