1-Sample Variance Test
Analyze PhaseTest whether the variance (or standard deviation) of your process is significantly different from a target or historical value. Uses the chi-square distribution. Critical for verifying process consistency and meeting specification tolerances.
Data Table
Paste data directly from Excel or Google Sheets — columns and rows will be imported automatically.
| # | ||||
|---|---|---|---|---|
| Row | ||||
| 1 | ||||
| 2 | ||||
| 3 | ||||
| 4 | ||||
| 5 | ||||
| 6 | ||||
| 7 | ||||
| 8 | ||||
| 9 | ||||
| 10 |
0 rows with data · 3 columns
e.g. 1.0 (enter σ² not σ)
Hypotheses
H₀: σ² = σ₀² = 1
H₁: σ² ≠ σ₀² (two-tailed)
Test statistic: χ² = (n−1)·s² / σ₀², follows a chi-square distribution with df = n−1.
Load data with at least 2 values to run the test