Question: Changing the sample size n. Refer to Exercise. What happens to the center line and control limits if
(a) the owner samples five consecutive sandwich orders?
(b) the owner samples seven consecutive sandwich orders?
(c) the owner uses minutes rather than seconds as the units?
Exercise: An x¯ control chart for sandwich orders. A sandwich shop owner takes a daily sample of six consecutive sandwich orders at random times during the lunch rush and records the time it takes to complete each order. Past experience indicates that the process mean should be μ = 85 seconds and the process standard deviation should be σ = 17 seconds. Calculate the center line and control limits for an x¯ control chart.