TABLE 8-2 A Quality Control Engineer Is Interested in the Mean Length

question 61

True/False

TABLE 8-2
A quality control engineer is interested in the mean length of sheet insulation being cut automatically by machine. The desired mean length of the insulation is 12 feet. It is known that the standard deviation in the cutting length is 0.15 feet. A sample of 70 cut sheets yields a mean length of 12.14 feet. This sample will be used to obtain a 99% confidence interval for the mean length cut by machine.
-Referring to Table 8-2, the confidence interval indicates that the machine is not working properly.

---

Definitions:

Warehouse Clubs

Large retail stores, often requiring membership, that sell a variety of goods at discounted prices, usually in bulk or large quantities.

Sam's Club

A membership-only retail warehouse club owned and operated by Walmart Inc., offering a variety of merchandise and services.

Costco

A multinational corporation that operates a chain of membership-only warehouse clubs offering a wide selection of merchandise.

Hypermarkets

Large retail spaces combining a supermarket and a department store, offering a wide range of products under one roof.