TABLE 14-7 A Supplier of Silicone Sheets for Producers of Computer Chips

Short Answer

TABLE 14-7
A supplier of silicone sheets for producers of computer chips wants to evaluate her manufacturing process. She takes samples of size 5 from each day's output and counts the number of blemishes on each silicone sheet. The results from 20 days of such evaluations are presented below.

She also decides that the upper specification limit is 10 blemishes.
-Referring to Table 14-7, an R chart is to be constructed for the number of blemishes. One way to create the upper control limit involves multiplying the mean of the sample ranges by D₄. For this data set, the value of D₄ is ________.