Calculate the Bias value and % Bias.
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%
