When estimating the difference between two population means, when should the normal distribution be used and when should the t-distribution be used?

Name: When estimating the difference between two population means, when should the normal distribution be used and when should the t-distribution be used?
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The Answer of When estimating the difference between two population means, when should the normal distribution be used and when should the t-distribution be used?

When Estimating the Difference Between Two Population Means, When Should