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Tests of Significance
What It Is Used For
To statistically determine if a sample represents a population or
if two or more samples are from the same population.
When to Use It
To confirm that an improvement is truly an improvement and not
just common cause variation in the process.
Important Notes
t-tests use sample means to look at the location of the process
output relative to a known population or to another population
(represented by another sample mean).
F-tests are used to compare the variances of two samples to
determine if the variation between the two populations they
represent are likely to be equal.
