Four common calculations, without a dataset.
- Control Chart Limits : Plots an efficiency curve based on the parameters to determine the size of a circuit board before implementing it.
- Range of variation : the interval that contains a given proportion of the population, based on a sample size. It is calculated by Method S or Sigma Method.
- IQC – Attributes and IQC – Measurements : acceptance inspection plans, including batch size and level in accordance with ISO standards.
💡 The confidence interval is the tool you use when you ask, «I have 30 observations; what bounds can I guarantee for the population?» The answer depends heavily on the sample size, and the difference between 30 and 100 observations is often surprising.