Which fact about a normal distribution leads to the factor 2 (or 1.960) in the approximate confidence

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Which fact about a normal distribution leads to the factor 2 (or 1.960) in the approximate confidence interval statement?

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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