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I just did a bias study on one of our chip scale package automated vision system. I used an excel template with formula based from MSA manual for bias independent sampling method. I took 15 readings and all were exactly the same with no rounding off. But when I input the readings, it turned out the lower & upper values of the 95% confidence interval of the bias are the same value which would result in a failed bias study.
Please help me understand what happened because based on the condition given for bias study, the bias should be unacceptable eventhough the average of the readings are close to the reference value. I checked the formula and I didn't see any discrepancy, or maybe I missed something.
Please help me understand what happened because based on the condition given for bias study, the bias should be unacceptable eventhough the average of the readings are close to the reference value. I checked the formula and I didn't see any discrepancy, or maybe I missed something.
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