The widths of copper lines in printed circuit boards must be close to a specifie

Question

The widths of copper lines in printed circuit boards must be close to a specified value. Three manufacturers were asked to prepare circuit boards with copper lines that are 0.400 m (micrometers) wide. (1 1 x 10-6 m.) Each manufacturer's quality control department reported the following line widths on five sample circuit boards (given in micrometers): rPru facturer! Manufacturer Manufacturer Manufacturer Manufacturer #1 0.410 0.406 0.413 0402 0.410 #2 0.411 0.410 0.411 0.411 0.410 #3 0.401 0.401 0.402 0.402 0.400 a. What is the range of the data provided by each manufacturer? Manufacturer #1 Number Manufacturer #3 amber

Explanation / Answer

Dear Student please let me know if you need anything else. Question a & c are not very clear to me.

a)

Manufacturar 1

Range is 0.402 to 0.413 micron

Variation is 0.011 micron

Manufacturar 2

Range is 0.410 to 0.411 micron

Variation is 0.001 micron

Manufacturar 3

Range is 0.400 to 0.402 micron

Variation is 0.002 micron

b)

Lower the variation in data better the precision

So manucaturar 2 is best in terms of precision.

Althought in terms of accuracy manufacturar 3 is best.

c)

Manufacturara 1 certainly misleading in its claim. Its neither precise nor accurate

Manufacturara 2 is best in terms of precision, however in terms of accuracy its not the best

Manufacturara 3 is not as precise as Manufacturara 2, however in terms of accuracy its the best among all the manufacturar

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