**Standard Deviation**

Population

Sample

**Standard Error**

**Z-scores**

Descriptive

z= (x – μ) / σ

Inferential

Z= x – (null hypothesis amount) / SE

Z-scores and Percentiles, click here

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**Standard Deviation**

Population

Sample

**Standard Error**

**Z-scores**

Descriptive

z= (x – μ) / σ

Inferential

Z= x – (null hypothesis amount) / SE

Z-scores and Percentiles, click here