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In quality control, a shift refers to a sudden, noticeable change in the process or product output, typically caused by a specific event or factor. A trend, on the other hand, is a gradual change over time in the process or product output, indicating a consistent direction of improvement or deterioration. Monitoring shifts helps identify immediate issues, while monitoring trends helps predict long-term performance.
Mean is the average.
I didn't mean what I said. What does antidisestablishmentarianism mean? My sister is mean. I don't like being mean. The mean of a set of values is the average. The mean temperature is much lower in the valley in spring.
The population mean is the mean value of the entire population. Contrast this with sample mean, which is the mean value of a sample of the population.