NDT Test Methods
Test method names often refer to the type of penetrating medium or…
What Is Non-destructive Testing?
Non-destructive testing (NDT) is a wide group of analysis techniques used in…
Statistics – Circular Permutation
Circular permutation is the total number of ways in which n distinct…
Statistics – Cluster sampling
In cluster sampling, groups of elements that ideally speaking, are heterogeneous in nature…
Statistics – Chi Squared table
The numbers in the table represent the values of the χ2χ2 statistics. Areas of…
Statistics – Chi-squared Distribution
The chi-squared distribution (chi-square or X2X2 - distribution) with degrees of freedom, k is…
Statistics – Chebyshev’s Theorem
The fraction of any set of numbers lying within k standard deviations…
Statistics – Central limit theorem
If the population from which the sample has a been drawn is…
Statistics – Boxplots
The box plot is a standardized way to display the distribution of…
Statistics – Z table
Standard Normal Probability Table The following table shows the area under the…


