Mean

n

Median

STDEV

Cp Cpk % out of tolerance

Min/Max

Compare with

Calculate Difference

Diff mean normally

Diff median not normally

Diff variation normally

Diff variation not normally

Normally test

Correlation

Regression

Kurtosis

Skewness

For commercial use

75 EURO

To check if the data-set is distributed according the normal distribution. Various statistical test assume that the data is normally distributed therefor it is important to check this. If the data is not normally distributed looking at the Kurtosis and Skewness and Histogram of the data gives an indication of the shape of the data.

- The smaller the p value the more unlikely the data-set is normally distributed.
- In Develve the minimum p value for normality is 0.10.
- The minimum advised sample size for this test is 20 samples.
- Alway check the Histogram of the data-set.
- What to do with not normally distributed Data

- RedData-set is not normally distributed
- OrangeSample size to small

Normal distributed data set | Not normal distributed data set |

With the A² value can the program interpolate in a table the p value.

Data file

- http://en.wikipedia.org/wiki/Anderson%E2%80%93Darling_test
- http://www.itl.nist.gov/div898/handbook/eda/section3/eda35e.htm