FTEST(array1, array2)

Returns the probability value from an F distribution.

array1The first array.
array2The second array.

* F.TEST was added in Excel 2010 to replace this function.
* An F-test returns the one-tailed probability that the variances in two arrays are not significantly different.
* The arguments must be either numbers or names, arrays, or cell references that contain numbers.
* If an array or reference argument contains text, logical values, or empty cells, those values are ignored; however, cells with the value zero are included.
* If the number of data points in array1 or array2 is less than 2, or if the variance of array1 or array2 is zero, then #DIV/0! is returned.
* This function claims to return the probability for the F-value in a one tailed test for the null hypothesis that the variances of two samples are equal. This actually returns the result for a two-tailed test.
* This function can be used to determine whether two samples have different variances.
* For the Microsoft documentation refer to support.microsoft.com

1=FTEST({1,2,3},{4,5,6}) = 1
2=FTEST({6,7,9,15,21},{20,28,31,38,40}) = 0.648

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