Probable Error
The first Quartile of a standard Normal Distribution occurs when
The solution is
. The value of 
giving 
is known as the probable error of aNormally Distributed variate. However, the number 
corresponding to the 50% Confidence Interval,
is sometimes also called the probable error.See also Significance
- Stolarsky-Harborth Constant
- Stolarsky's Inequality
- Stomachion
- Stone Space
- Stone-von Neumann Theorem
- Stopper Knot
- Straight Angle
- Straightedge
- Straight Line
- Straight Polyomino
- Strange Attractor
- Strange Loop
- Strangers
- Strassen Formulas
- Strassman's Theorem
- Strassnitzky's Formula
- Strategy
- Stratified Manifold
- Strehl Identity
- Striction Curve
- String Rewriting
- Strip
- Strong Convergence
- Strong Elliptic Pseudoprime
- Strong Frobenius Pseudoprime