Enter numbers separated by commas to calculate standard deviation, variance, mean, sum, and margin of error.
Count (N):
Sum (Σx):
Mean (μ):
Variance (σ²):
Standard Deviation (σ):
The standard error of the mean (SEM) is calculated as: σₓ = σ / √N = .
Below are the margins of error (or confidence intervals) at different confidence levels. A 95% level is typically used.
| Confidence Level | Z/t-score * SEM | Interval (Mean ± Margin) | Margin | Margin % |
|---|
| Value | Frequency | Percentage |
|---|