:In this case, the average of the first chip A1 (in cell B2) is subtracted from the data in cell B4. The difference is then divided by the standard deviation of the first chip A1 (in cell B3). | :In this case, the average of the first chip A1 (in cell B2) is subtracted from the data in cell B4. The difference is then divided by the standard deviation of the first chip A1 (in cell B3). |