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A.which distribution is used for proportions and means when the population standard deviation is known? B.which...

A.which distribution is used for proportions and means when the population standard deviation is known?

B.which distribution is used for means when the population standard deviation is unknown?

Math   Statistics-And-Probability   
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Answer #1

A.

When standard deviation is known , for proportions and means standard normal distributions are used.

B.

When standard deviation is unknown , for means t-distributions are used.

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