1)
Larry Shudders Potato Chip Company wants to use statistical process controls to ensure that the company delivers exactly the product advertised. To begin the quality management campaign 25 samples of the finished product are taken at random to determine if the contents are 7 ounces as stated. Below are the weights in ounces for each of the four observations in each sample.
Sampling Bags of Potato Chips for Weight
Develop an X chart and an R chart, and plot each sample. Is the process in control? Why, or why not?
General Mortar’s Truck Engine
Assembly Plant is concerned about the quality of the engines it produces.
The production department decides to use statistical process controls to
analyze the state of the production line. 25 finished engines are taken
at random and each one of the 976 parts is examined for defects. The
number of defective parts for each engine is reported below.
Develop a control chart with a 99.7% level of confidence (3 standard deviations) and plot each sample. Is the process in control? Why, or why not?
