Statistics Calculator — Std Dev, Variance & Z-Score

Introduction

Paste or type a dataset to get full descriptive statistics — population and sample variance, quartiles, and z-scores.

Step-by-step

1. Enter numbers separated by commas or spaces
2. Review descriptive statistics
3. Optionally compute a z-score

Worked example

Data 2, 4, 4, 4, 5, 5, 7, 9 yields mean 5, median 4.5, sample std dev ≈ 2.138.

Use cases

• Summarize experimental lab measurements
• Check spread and central tendency before analysis
• Compute z-scores for outlier detection

Frequently asked questions