Given the Following Process Control Data for a Quality Attribute

question 89

Short Answer

Given the following process control data for a quality attribute (three samples of size 400 each):
If the process proportion of defectives is unknown,using .10 alpha risk control limits,do any of the sample proportions indicate an out-of-control process proportion of defectives?

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Definitions:

Cost Of Goods Sold

The expenses directly related to the manufacturing of products a company sells, encompassing both materials and labor costs.

Materials Price Variance

The difference between the actual cost of materials and the expected (or standard) cost, used to control and manage costs.

Labor Efficiency Variance

The difference between the actual hours worked and the standard hours expected to complete a task, multiplied by the standard hourly labor rate.

Materials Price Variance

The discrepancy between the real expense of direct materials employed in manufacturing and the anticipated standard expense for those materials.