When testing m or the difference of means 1 2 from independent populations, how

Question:

When testing m or the difference of means µ₁ – µ₂ from independent populations, how do we decide whether to use the standard normal distribution or a Student’s t distribution?

Distribution
The word "distribution" has several meanings in the financial world, most of them pertaining to the payment of assets from a fund, account, or individual security to an investor or beneficiary. Retirement account distributions are among the most...