Six Sigma Case Studies with Minitab®

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3

Confidence Intervals to Assess Variation

in Fat Content at a Fast-Food Restaurant

Hamburrgerr, Inc. is a fast-food restaurant serving hamburgers among a few

other items. The restaurant claims that the average fat content in the ham-

burgers is 15 grams.

Section 3.1 gives a brief description of the dene phase. Section 3.2 illus-

trates the measure phase with detailed instructions for using Minitab

®

. The

analyze phase is briey discussed in Section 3.3. Section 3.4 illustrates the

improve phase with detailed instructions for using Minitab

®

. Finally, the

control phase is briey discussed in Section 3.5.

3.1 Define Phase

A few of the customers comp ...