The Pacific Fruit Company in Problem 3-17 has designed its packaging process for boxes to hold a
Question:
The Pacific Fruit Company in Problem 3-17 has designed its packaging process for boxes to hold a net weight (nominal value) of 9.0 oz. of raisins with tolerances of ±0.5 oz. Using the process mean and control limits developed in Problem 3-17, compute the process capability ratio and index, and comment on the capability of the process to meet the company’s box weight specifications.
Data in Problem 3-17
A machine at the Pacific Fruit Company fills boxes with raisins. The labeled weight of the boxes is 9 oz. The company wants to construct an R-chart to monitor the filling process and make sure the box weights are in control. The quality-control department for the company sampled five boxes every two hours for three consecutive working days. The sample observations are as follows:
a. Construct an R-chart from these data with 3σ control limits, plot the sample range values, and comment on process control.
b. Construct an x-chart in conjunction with the R-chart, plot the sample observations, and, using both x- and R-charts, comment on the process control.
Step by Step Answer:
Operations And Supply Chain Management
ISBN: 9781119577652
10th Edition
Authors: Roberta S. Russell, Bernard W. Taylor