What is the difference between using both tails versus one tail of the sampling distribution in terms

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What is the difference between using both tails versus one tail of the sampling distribution in terms of
(a) The size of the region of rejection?
(b) The critical value? 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...
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