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Statistics Symbols - Z

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Symbol: Z ( or Z-score)

This is the standard normal distribution. Standard normal distribution has mean =0 and SD=1.
Formula used:
, where X~ Normal (mean=µ, SD=ơ)

Symbol: Zc

It is the critical value for the confidence level c.
Formula used:
Zc= Area under the standard normal curve that falls between -Zc and Zc and is equal to c.

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