Precision or Accuracy

1. A 50 pound weight is placed on a bathroom scale and the scale reports a weight of 50 pounds. This is an indication of the __________of the scale.

• Accuracy

• Precision

A 50 pound weight is placed on a bathroom scale five times. Each time the scale displays a weight of 47 pounds. Is this scale indicating a higher degree of accuracy or of precision?

• Accuracy

• Precision

A hole drilled into a manufactured part is specified to have a diameter of 1.50 cm. Ten parts are sampled from a production run, and the average hole size is measured to be 1.57 cm. Is the average hole diameter measurement a better indicator of the accuracy or precision of the drilling process?

• Accuracy

• Precision

A hole drilled into a manufactured part is specified to have a diameter of 1.50 cm. Ten parts are sampled from a production run. The hole diameters of the parts range in size from 1.43 cm to 1.55 cm. Is the range of measurements a better indicator of the accuracy or precision of the drilling process?

• Accuracy

• Precision

True of False

A box plot is a graphical model of data for a single variable.

• True

• False

What is the first step in the design process?

• Define problem

• Generate concepts

• Evaluate solution

• Present solution

What is the last step in the design process?

• Define problem

• Generate concepts

• Evaluate solution

• Present solution

Which is NOT included in the construction and test part of the design process?

• Construct a testable prototype.

• Justify the solution part.

• Collect and analyze test data.

• Plan prototype to ensure performance, usability, and durability.