Standard deviation is the measure of variation in a process. Describing variation by standard deviations lets us easily compare processes.
Dispersion is the degree of variation in the data. In other words, the extent of the spread of values from the mean.
A data collection form is a best practice of data collection. It’s a way of recording your approach to obtaining the data you need to perform your analysis.
A response plan sets out what to do if a process doesn’t meet one of the quality assurance requirements in the control plan.
The Central Limit Theorem states that the distribution of the sample means approaches normal regardless of the shape of the parent population.