When testing hypotheses about and constructing confidence intervals for μ1 − μ2, we utilize the statistic, 
. What are the mean and variance of the sampling distribution of 
?
Definitions:
Population
The total number of individuals or entities within a specified area or group.
Drug Tolerance
A physiological state where the effectiveness of a drug decreases as a result of repeated use, leading to the need for increased doses to achieve the same effect.
Caffeine Dependency
A condition defined by a compulsive need for caffeine to achieve alertness or avoid withdrawal symptoms, reflecting a physical or psychological reliance.
Caffeine Withdrawal
Symptoms that occur after sudden cessation of caffeine consumption, including headache, fatigue, and irritability.
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