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Quality Quiz:Professor Cleary
Another quiz from Professor Cleary

Congratulations: "C" is correct!

Common sense and thrifty purchasing practices suggest that the lower bid should generally be taken—but only if all else is equal. Even though the difference in price amounts to a total of $2,000 (a budget swing from $1,000 under budget to $1,000 over budget), he should have first investigated whether the cheaper supplier’s process was capable. The company had, in fact, previously purchased units from both suppliers, but had had more success with parts from Center of Spec Company. For this unit, diameter is the critical dimension. The smoothed histograms for the Center of Spec Company and the In Spec bids are shown below.

These diagrams indicate clearly that all of the parts from both companies fall within the specification. Clearly, the Center of Spec Company produces parts that are more like each other than the In Spec Company does. Typically, parts that reflect less variability lead to higher quality in the final product.

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