Through process measuring a number of pizza delivery times, Mary Jane’s Pizzeria finds the mean of all samples to be 27

Accounting Apr 23, 2021

Through process measuring a number of pizza delivery times, Mary Jane’s Pizzeria finds the mean of all samples to be 27.4 minutes, with an average sample range of 5.2 minutes. They tracked four deliveries per hour for 18 hours to obtain their samples.

a. Is this an example of variable or attribute sampling data?

b. Find the UCL and LCL for both the x - and R-charts.