The basic statistics consist of a summary of the measurement data including:

·    Reference, which represents the given or known measurement of the standard.

·    Mean, which is the average of all measurements of the standard.

·    StDev, which is the standard deviation of all measurements of the standard.

·    6*StDev (SV), which is 6 times the standard deviation. This value represents the study variation. While 6 is the default, you can specify another value.

·    Tolerance (Tol), which is the tolerance range of the measured component. It is the difference between the upper and lower specification limits.

These statistics give an overall characterization of your measurements. It is helpful to see how close your mean is to the reference value and how large the standard deviation is.

For the thickness data, the mean value (0.024985) is slightly lower than the reference value (0.025), and the standard deviation (0.0000438) is small; however, the tolerance (0.0007) is also very small, which leaves little room for variation in measurements.