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A standard with a known value of 25.4 mm is checked 10 times by one mechanical inspector using a dial caliper with a resolution of 0.025 mm. The readings obtained are:25.425 25.425 25.400 25.400 25.375 25.400 25.425 25.400 25.425 25.375 The tolerance value of this gage is ± 25 mm.Calculate the Bias value and % Bias.

OPTIONS

  • 0.05, 1%
  • 0.01, 0,2%
  • 0.1 , 10%
  • 0.5 , 50%

ANSWER

0.05, 1%

EXPLANATION

1)Find the Average of Measurements. In this case, Xbar = 25.405 mm

2)Bias = Average – Reference Value = 25.405 – 25.4 mm = 0.05 mm

3)% Bias = 100 * (Bias/Tolerance) % = 100 * (0.05/0.5) % = 1%

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