1.10 Statistical analysis

Statistical analysis :

• To separate as far as possible the truth from error by narrowing and define the region of doubt.

• To make statistical methods and interpretations meaningful, a large number of measurements is usually required.

• If ordinates created at deviations of ±r=0.6745σ, half area under the curve is enclosed between these limits. The quantity r is called probable error.
  

• case 1 : Probable error of one reading : r = 0.6745σ
  

• case 2 : Probable error of mean : r_m = r/√(n-1)