Final answer:
In a Quality Rating System, demerits per unit are calculated like average demerits per unit, which is true. For inconsistent sample sizes in attribute charts, construct individual control charts with subgroup-specific control limits. Control limits within specifications do not guarantee all parts meet specifications, as this is a false assumption.
Step-by-step explanation:
The question asks about concepts related to quality control and statistical process control (SPC), which are integral parts of business operations and process improvements in manufacturing and service delivery. In terms of the Quality Rating System, points in demerits per unit are indeed calculated in a manner similar to calculating the average demerits per unit, which is true.
When dealing with an attribute chart with inconsistent sample sizes, it is recommended to construct a control chart with control limits for each subgroup, using its respective sample size. This ensures that the variations due to the sample size differences are accounted for when evaluating the process stability.
It is also false to assume that when control limits are inside of specifications, all individual parts will be inside of the specifications. Control limits are indicators of the process variation, not the conformance to product specifications. Parts may still fall outside the specifications even when control limits are within specification limits due to individual variation.