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An over-the-counter drug manufacturer wants to examine the effectiveness of a new drug in curing an illness most commonly found in older patients. Thirteen patients are given the new drug and 13 patients are given the old drug. To avoid bias in the experiment, they are not told which drug is given to them. To check how the effectiveness depends on the age of patients, the following data have been collected.
The variables are Effectiveness = the response variable measured on a scale from 0 to 100,
Age = the age of a patient (in years) ,
Drug = a dummy variable that is 1 for the new drug and 0 for the old drug.
The regression model, Effectiveness = β0 + β1Age + β2Drug + β3Age × Drug, is estimated and the following results are obtained. For which age is the predicted effectiveness of the old and new drug about the same?
Irrevocable
Not able to be changed, reversed, or recovered; final and unalterable.
Renunciation
The act of formally or officially giving up a right, position, or responsibility, often in a legal or ceremonial context.
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A right granted by legislation, which is enacted by a legislative body.
Intestate
The state of dying without having made a legal will, leading to the distribution of one's estate according to state or country laws.
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