TABLE 17-3 A Quality Control Analyst for a Light Bulb Manufacturer Is

question 56

Multiple Choice

TABLE 17-3
A quality control analyst for a light bulb manufacturer is concerned that the time it takes to produce a batch of light bulbs is too erratic. Accordingly, the analyst randomly surveys 10 production periods each day for 14 days and records the sample mean and range for each day.

-Referring to Table 17-3, suppose the analyst constructs an R chart to see if the variability in production times is in-control. What is the center line of this R chart?

• A) 4.8
• B) 6.0
• C) 6.9
• D) 7.1

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