Victoria is the southernmost major city in Western Canada, and is located about 100 kilometres (60 miles) from BC's largest city of Vancouver on the mainland.
Henry Gantt, a mechanical engineer, invented the Gantt chart in the 1910s. He designed his chart so that production foreman could watch schedules to ensure the work was being done on time. Gantt charts were used when building the Hoover Dam and for organizing large projects.
\(\bar{X}\) and \(s\) Charts. \(\bar{X}\) and \(s\) Shewhart Control Charts. We begin with \(\bar{X}\) and \(s\) charts. We should use the \(s\) chart first to determine if the distribution for the process characteristic is stable. Let us consider the case where we have to estimate \(\sigma\) by analyzing past data.