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Variation F-test

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Basic Statistics
Mean
n
Median
STDEV
Cp Cpk % out of tolerance
Min/Max
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Calculate Difference
Diff mean normally
Diff median not normally
Diff variation normally
Diff variation not normally
Normally test
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To calculate if there is a significant difference between variation of the two data-sets. It calculates the F-test between this column and the comparing column.



Interpretation

Options

Colors of the cells

Formula Calculating F value

formula
Where s1 is the smallest of the comparing STDEV values.

With the F value and the degrees of freedom can the program calculate the p value.

Sample size

not equal

formula
This results in the degrees of freedom out of the formula table, the Minimum sample size is formula

bigger smaller

formula
This results in the degrees of freedom out of the formula table, the Minimum sample size is formula

Legend

n = n
formula = STDEV smallest variation
formula = STDEV biggest variation
formulaDegrees of freedom

Example

Select Variation test. To use the F-test test first unselect "non normal distributed" when the box is selected the Levene test is calculated. Then select Diff variation.
Data file

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