CH.6 part 1&2 Prob and Stat

Control Chart

The control chart is a graph used to study how a process changes over time. Data are plotted in time order.

μ - Sample Mean σ - Standard Deviation

Calculating Standard Deviation:

  • Work out the Mean (the simple average of the numbers)
  • Then for each number: subtract the Mean and square the result
  • Then work out the mean of those squared differences.
  • Take the square root of that and we are done